No, it's not porn... it's http://www.confluence.org/index.php
Basically, it's a bunch of nutters who wander the world with their handheld GPS taking pictures of the places where the lines of latitude and longitude meet. Sounds boring, but I love looking at all the strange places they go to...
P.S. If anyone's going to Turkey and you have a handheld GPS, you might be able to get yourself on here...
http://www.confluence.org/country.php?id=26