GrottoCenter is wiki-like website for cavers. The site allows cavers to share their knowledge and favourite caving locations with other cavers. GrottoCenter includes a Google Map that shows the locations of the submitted caves and the site's members.
Currently the map shows the location 0f over 12,000 caves and 361 grottoes. As well as displaying the location of caves the map includes geological overlays for America, Australasia, Europe and the Poles.
If you click on any of the plotted caves on the map you can get further details and links to any relevant websites about the selected cave.