This map is based on the 1980 publication "Thermal Springs List for the United States", from the NOAA's National Geophysical Data Center, which lists 1661 hot springs in the United States. The database is also available online, and via a non-Google map interface that actually has some nifty features.
This map isn't too interesting even for hot springs fans. The data is static, decades old, already available elsewhere, and not even 100% accurate. However, for map hackers the map does show one way of presenting fairly large data sets in the Google Maps API, which gets way too slow past a couple hundred markers. I work around that problem here using two techniques:
Hot Springs Enthusiast
Yahoo's hot springs page
Map courtesy of the Google Maps API.
Other Google Maps apps: Paris Star Forts, Transpac 2005 Tracks, BART Map/Schedule, Paris Metro Map, Google Planimeter.
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