OpenHistoricalMap: Designed to store and display map data throughout history
The first think I noticed was this "OHM Worldwide Rendering Testbed" about 30 miles east of Seattle. <a href="https://openhistoricalmap.org/#map=12/47.7505/-121.7306&layers=O&date=1900&daterange=1800,2022" rel="nofollow">https://openhistoricalmap.org/#map=12/47.7505/-121.7306&laye...</a>