Get list of surrounding buildings based on coordinates from open database on Web

Question

I would like to get a list of well-known buildings(museums, castles etc..) within X meters radius of the current coordinate. I would like to query them in PHP.

Do you know any such database that can be queried?

Answer 1

GeoNames:

The GeoNames geographical database covers all countries and contains over eight million placenames that are available for download free of charge.

Answer 2

Google Places should do well. As far as I know, open developer beta has already been released (and since it's open I'm quite sure it's stable enough).