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openhistoricalmap.org
OpenHistoricalMap
@openhistoricalmap.org
490 followers 1.7K following 100 posts
Explore the world throughout time, mapped in minute detail by people like you & dedicated to the public domain. OHM is a charter project of @osmus.bsky.social and cousin of @openstreetmap.bsky.social. #oldmaps #dh #hgis

https://www.openhistoricalmap.org
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Reposted by OpenHistoricalMap
digitscotland.bsky.social
This summer, investigations unearthed evidence that a hillfort in Dumfries & Galloway may have been besieged by an invading Roman force 1,900 years ago ⚔️

Experts say the new data from Burnswark Hill "challenges long-held assumptions about Scotland’s past": www.digitscotland.com/five-of-scot...
January 5, 2026 at 2:03 PM
openhistoricalmap.org
In December, the #OpenHistoricalMap community added 55,351 dated elements, 13,877 buildings, and 8,959 railroad miles. The average age of a dated element fell by 8 months, and the average year shifted one year later. All this with the help of 31 new contributors – welcome!

osm.wiki/OHM/Statistics
OpenHistoricalMap/Statistics - OpenStreetMap Wiki
wiki.openstreetmap.org
January 1, 2026 at 9:39 AM
openhistoricalmap.org
We deeply appreciate all the help that #GreenInfo provided over the years. We look forward to spending an unprecedented 2026 with the #HistoricalMapping and @osmus.bsky.social communities!
January 1, 2026 at 9:28 AM
openhistoricalmap.org
The main #VectorTiles tileset contains route information for more informative transportation map styles. A new tileset contains territories as polygons, so your custom map can color in a country or other administrative region.
A raw view of the data showing route_lines features with indexed tram route attributes. A raw data view of the world highlighting country territories as polygons, showing details about Numidia and France.
January 1, 2026 at 9:28 AM
openhistoricalmap.org
The map can label #toponyms in #MinorityLanguages #IndigenousLanguages #AncientLanguages, like no other world atlas you’ve ever flipped through.
Babylonia as 𒆳𒆍𒀭𒊏𒆠 Ur as 𒌷𒀕 Uruk as 𒋀𒀕𒆠
January 1, 2026 at 9:28 AM
openhistoricalmap.org
If you contribute to @wikipedia.org @wikidatacommunity.bsky.social #WikimediaCommons #Wikivoyage, you can join OpenHistoricalMap in just a few clicks, without having to juggle yet another password for yet another wiki. It works a lot like our existing OpenStreetMap login support.
Hi Example, In order to complete your request, OpenHistoricalMap needs permission to access information about you, including your email address, on all projects of this site. No changes will be made with your account.
January 1, 2026 at 9:28 AM
openhistoricalmap.org
#OSMCha can visualize giant changesets without timing out or throwing an error. No one will sneak another empire into OHM without the community noticing it.
OSMCha showing a changeset that adds many streets to Mannheim. OSMCha showing a changeset that adds boundaries around the world to the French Empire.
January 1, 2026 at 9:28 AM
openhistoricalmap.org
#scrapers and #crawlers are waging a constant #DDOS on our site and driving up cloud hosting costs. We’re coping, but if it keeps getting worse, will OHM last? 🫠
Protection pack (web ACL) activity: summary of your protection rules and how their order contributes to terminating actions. Block-Old-Chrome-UA, Block-countries, and ipset-block-production siphon off about a sixth of the traffic. Of 53,720 requests, 47,700 are allowed and 6,030 are blocked.
January 1, 2026 at 9:28 AM
openhistoricalmap.org
The biggest developments in #OpenHistoricalMap tech over the past 6 months 🧵

forum.openhistoricalmap.org/t/staying-af...
Staying afloat, Wikimedia logins, ancient writing, and more
In the half a year since we started letting you log in using your OpenStreetMap account, localize map labels into your language, and more, our development team has been busier than ever. Keeping the ...
forum.openhistoricalmap.org
January 1, 2026 at 9:28 AM
Reposted by OpenHistoricalMap
londontopsoc.bsky.social
Our latest bi-annual Newsletter, Issue 101, has just been published, containing articles on "Ordeal & Triumph: Middle Temple at War" and "Mapping London and the world’s history with OpenHistoricalMap".

Read it here: publuu.com/flip-book/86...
LTS No 101 (November 2025)
Online Flipbook created with Publuu Flipbook Maker.
publuu.com
November 27, 2025 at 1:10 PM
Reposted by OpenHistoricalMap
carwil.bsky.social
Just added my first object to OpenHistoricalMap: the Mississippian and later Cherokee town of Toqua.

#NativeSoutheast
Open Historical Map interface showing a region in eastern Tennessee at 1707 CE. Title highlights: Node: Toqua [950 – 1819] Toqua (Cherokee: ᏙᏉ, romanized: Toquo) was a prehistoric and historic Native American site in Monroe County, Tennessee, located in the Southeastern Woodlands. Toqua was the site of a substantial ancestral town that thrived during the Mississippian period (1000-1600 CE). Added prehistoric Native American and Cherokee town Edited 2 minutes ago by Carwil Changeset #207314 0 Location: 35.5658732, -84.1696025
December 2, 2025 at 3:59 PM
openhistoricalmap.org
In November, the #OpenHistoricalMap community added 62,421 dated elements, 21,441 buildings, and 8,072½ railroad miles. The average age of a dated element fell by 17 months, and the average year shifted one year later. All this with the help of 35 new contributors – welcome!

osm.wiki/OHM/Statistics
OpenHistoricalMap/Statistics - OpenStreetMap Wiki
wiki.openstreetmap.org
December 1, 2025 at 3:56 PM
openhistoricalmap.org
Props to @timetravel628.bsky.social for a gorgeous new way to explore the OpenHistoricalMap’s coverage of #HistoricBoundaries!
December 1, 2025 at 7:06 AM
Reposted by OpenHistoricalMap
mapcenter.com
By request, here's a thread of books that I think make excellent gifts this holiday season (obviously they're cartographically inclined, you know me)

1. Best anthology
"All Over the Map" by Betsy Mason and Greg Miller
A gorgeous, full color history of maps mind-bending maps from around the world.
November 21, 2025 at 7:35 PM
openhistoricalmap.org
Have you seen OldInsuranceMaps.net? It's a fantastic, easy-to-use and *Sanborn-focused* georectification and stitching site. It's run by @mradamcox.bsky.social, who loves working with users of his site. Not sure if this is helpful, but always good to know about!
OldInsuranceMaps.net
A crowdsourcing site for creating and viewing georeferenced mosaics of historical Sanborn fire insurance maps
OldInsuranceMaps.net
November 21, 2025 at 8:15 PM
openhistoricalmap.org
Our database will be in read-only mode for a planned upgrade next Monday, November 24, at 19:00 UTC. We expect the upgrade to take about 3 hours. During that time, you won’t be able to save any changes, but you’ll be able to view and query the map as usual. Thank you for your patience.
November 18, 2025 at 5:32 PM
openhistoricalmap.org
It was a privilege to introduce the software #internationalization and #localization community to #OpenHistoricalMap (and #OpenStreetMap and @maplibre.org) at #UTW2025. Join us in mapping yesterday already!

#i18n #l10n
A laptop showing OpenHistoricalMap showing Spain in 1925, held up in front of a sign with the Unicode logo, followed by: time zone conversion, alphabetical sorting, metric versus imperial, scientific notation. Bidirectional text (spelled backwards). Currency exchange, calendar formats, emoji searchability.
November 13, 2025 at 7:10 PM
openhistoricalmap.org
In October, the #OpenHistoricalMap community added 87,784 dated elements, 28,666 buildings, and 15,202½ railroad miles. The average age of a dated element fell by 15 months, and the average year shifted one year later. All this with the help of 40 new contributors – welcome!

osm.wiki/OHM/Statistics
OpenHistoricalMap/Statistics - OpenStreetMap Wiki
wiki.openstreetmap.org
November 6, 2025 at 8:32 AM
openhistoricalmap.org
...and he'd love to have helpers. Maybe, just maybe, someone's even already put this together as part of some HGIS effort?

Editing on OpenHistoricalMap is easy & we have guides for how to tag things for sourcing and retrieval!

wiki.openstreetmap.org/wiki/OpenHis...

#Crowdsource #OpenData
OpenHistoricalMap/Projects/Germany/Autobahn - OpenStreetMap Wiki
wiki.openstreetmap.org
November 5, 2025 at 12:43 AM
openhistoricalmap.org
Anyone mapping the history of the German Autobahn? We have a particularly fleißig mapper who has set up a project for the daunting task of mapping the historical evolution of die Bundesautobahn & he's off to a great start...

#HGIS #OpenStreetMap #OpenHistoricalMap #DH #Germany #Highways #History
November 5, 2025 at 12:43 AM
Reposted by OpenHistoricalMap
openhistoricalmap.org
The breakage from last week is now fixed. You can once again use the map in any language and preview tagged images and Wikipedia articles in the sidebar. Please let us know if you continue to see any issues.
October 29, 2025 at 10:18 PM
openhistoricalmap.org
The breakage from last week is now fixed. You can once again use the map in any language and preview tagged images and Wikipedia articles in the sidebar. Please let us know if you continue to see any issues.
October 29, 2025 at 10:18 PM
Reposted by OpenHistoricalMap
britishlibrary.bsky.social
Secret Maps opens today! 🤫 🗺️

From medieval manuscripts to Cold War espionage, our new exhibition explores how maps have hidden as much as they revealed for over 600 years.

Book now: bit.ly/BLSecretMaps
October 24, 2025 at 12:26 PM
openhistoricalmap.org
Any Australian OHM mappers out there? This seems like a great complement to our efforts that might benefit from an improved 1970s Melbourne basemap!

#Australia #DH #PastMapping
#OpenStreetMap #Melbourne
wragge.hcommons.social.ap.brid.gy Tim Sherratt @wragge.hcommons.social.ap.brid.gy · Oct 20
New prototype from my #slvresidency! This one lets you explore photos from the Committee for Urban Action collection by selecting one of the highlighted roads on a map of Victoria. It's very much work-in-progress and will probably change a lot, but you can […]

[Original post on hcommons.social]
Screen shot of my prototype CUA collection browser, showing a map of Melbourne with roads highlighted in blue. The currently selected road is highlighted in red. Below the map, photos are displayed in film strip style.
October 24, 2025 at 6:32 PM
openhistoricalmap.org
We’re aware that the map on our homepage is currently nonfunctional in some languages. If you are seeing this issue, please switch the interface to English for now. Thank you for your patience.

forum.openhistoricalmap.org/t/broken-hom...
Broken homepage map (in some languages) and inspector images
The map on the homepage is currently nonfunctional in some languages. If you are seeing this issue, please switch the interface to English for now. To change your interface language, click the 文A butt...
forum.openhistoricalmap.org
October 22, 2025 at 10:29 PM