Flickr is introducing a feature called places — this will give photos taken at a place. You should be able to search based on the name of a place and find photos taken there.
Photo organization is an important problem and digital cameras have made it a ‘hot’ problem. This is definitely a nice feature. Once cameras get GPS, this will become a good method to use. Most photo management systems already allow organization based on time. Place based organization will make it more convenient. And then we will get to real event-based organization.