OpenHistoricalMap

OpenHistoricalMap goes beyond the present, mapping places throughout the world… throughout the ages.
No community is too small, no story too obscure to add to this map.
Everyone has something to contribute, including you!

Go to the map • Learn more…

Use

Go to the main map and navigate to a place and time of interest using the time slider. Share the map to spread the word about our project. Explore the many ways you can reuse OpenHistoricalMap in your own storytelling and software projects.

Contribute

To contribute to OpenHistoricalMap, go to the main map, zoom in to a place of interest, and click the “Edit” button. If you are familiar with editing OpenStreetMap, the OpenHistoricalMap editing experience is very similar. See the tagging guidelines for information on a few changes we’ve made to accommodate the time dimension. Please report any issues and send us your ideas on GitHub or our forum.

Then and now

From OpenHistoricalMap's community projects:

Left: The public transport system in Milan in 1906. Right: The same location today.

On this day

Selected establishments and disestablishments on September 10:

221 BCE: The Qin dynasty (Ch'in dynasty) is established when Ying Zheng declares himself emperor.
1721: After the Great Northern War, the Treaty of Nystadt demarcates the border between Russia and Sweden.
1822: Michigan Territorial Governor William Hull redefines the boundaries of Oakland County and St. Clair County by executive order.
1823: Lock 53 comes into operation on the Erie Canal in New York State.
1919: Under the Treaty of Saint-Germain-en-Laye, Tyrol is divided into the State of Tyrol and Region of Trentino–Alto Adige.
1920: Groß-Berlin is established. With 3.8 million inhabitants, it was the most populous municipality in the world after London and New York and, at 878 km², the most extensive after Los Angeles.
2016: The Wuppertal Clock Museum (Wuppertaler Uhrenmuseum) closes in Wuppertal, North Rhine–Westphalia, after 58 years in operation.

Statistics

3.6M
dated elements
758k
buildings
612k
railroad miles
97
average age
1960
average year
2,219
contributors

Source: Overpass API, Overpass API, Planet
September 1, 2026

Historical statistics

News

July 23, 2026: You can make advanced edits right inside your Web browser using Level0.
July 10, 2026: You can filter search results by the city, region, and country.
April 16, 2026: The official vector tilesets are now available as TileJSON.
April 15, 2026: Our tagging pages more consistently link to other OHM tagging pages instead of often conflicting OSM tagging pages.
April 14, 2026: The tile server has migrated from Tegola to Martin for improved reliability and performance.

Older news

Events

September 11, 2026: BayGeo/SJSU SAVI GeoEducation Summit in San José, California (register)
October 27, 2026 – October 29, 2026: State of the Map LatAm in Mexico City
November 2, 2026 – November 4, 2026: FOSS4G North America in Sacramento, California