Flickr Commons compiled a gallery of its most popular photos to celebrate the site's fifth birthday. (via the Library of Congress & Flickr Commons)
The Eagle Nebula (M16): Peering Into the Pillars of Creation (A nearby star-forming region about 7,000 light years from Earth.), 2008.
Source: Smithsonian Institution / via: flickr.com
An American soldier with a joey, 1942
Source: Australian War Memorial Collection / via: flickr.com
View towards the Old Town and the Southern part of Stockholm city, 1900.
Source: Swedish National Heritage Board / via: flickr.com
Eénwielige motorfiets / One wheel motor cycle, 1930.
Source: Nationaal Archief / via: flickr.com