Listening to Ergun and Emir talking about Islam, I came across a very odd description of the Kaaba. In the clip, Emir calls it a 30 foot by 50 foot stone (link to clip). The kaaba is a building, made of granite and usually covered in black cloth. It is made from stone, but not a single stone. There is a famous black stone there, at one corner of the Kaaba. Muslim pilgrims often try to kiss that stone, although apparently kissing the stone is optional. The black stone itself is relatively small, and was broken into pieces in the middle ages. The stone is said to be about 1 foot in diameter.