Panoramio is a photo-sharing community powered by Google that allows users to tag their photos with geographic information so they can be plotted on a map and searched for by location. You can browse by location, and click on individual images from the map, or search for specific sites and locations.
Some of the images are indeed panoramas, and Panoramio includes both flat and spherical panoramas (the latter provide a 360º of a place). For example, check out this haunting spherical panorama of the Holocaust Monument in Berlin.
This website is useful for studying architecture, cities, and the built environment, and it’s also great for some arm-chair traveling. You can also add your own images to the project.
For more information or to start exploring, check out Panoramio!