There are many great map-based apps that pinpoint a location when you know what you're looking for. TapAMap is different. It's for when you don't know what you're looking for. It's for exploring.
When you find a place that sparks your curiosity, a touch can tell you whether there's information about the place. It's a way of tapping into the wealth of web-based information by starting from a map.
Below are screenshots from the iPad version.