National Geographic Found
Celebrating 125 years of National Geographic, this Tumblr blog is a curated collection of photography from the archives. Many of the pictures are being published for the first time.
timg
This is a really nice and simple idea: view photos from a specific place taken at a specific time. Voyeuristic fun.
Related links
Constant Setting
This URL displays a picture of a sunset (from Flickr) taken wherever the sun is setting right now.
Historypin | Home
Old photos placed on a map. Quite engrossing.
Photos taken in Brighton on Flickr!
Flickr Places. This is what George announced at dConstruct. It's enthralling: interestingness mashed up with geotagging.
TimeGuessr
Where and when were these photographs taken?
It’s like that Chronophoto game I linked to with an added dimension of location.