The weeping column in Hagia Sophia (livingtuscany.wordpress.com)
The weeping column in Hagia Sophia (livingtuscany.wordpress.com)
The weeping column in Hagia Sophia (livingtuscany.wordpress.com)
The weeping column in Hagia Sophia (livingtuscany.wordpress.com)
The weeping column in Hagia Sophia (livingtuscany.wordpress.com)
The History of Byzantium 
It is fascinating to see people line up to this and place their thumb the the hole and try to spin their palm 360 degrees around. No one seems to know why they try it, but they see others do it and give it a shot.