This page lets you access some beautiful, stranges, extraordinary photos coming directly for your great convenience from the beautiful internationl photo album named Flickr.com (owned by Yahoo!).
This page works by 'photo-tag-search-tool' that lets you get only the pictures you want to list and not bad results as so often on the 'internet' network.
On Flickr.com, photos are coming from the world wild world and at anytime.
There is always an update of one or other user that lets you see photos so rencents of the differents subways/metros/trains-rails networks around the world.