This site has Mp3 demonstrations of every weird instrument you can imagine , a photo of the instrument and info ! One of my favorites
Hehe, i was thinking it would be awesome to have a Sample Library with those sounds, so unique they are . A guy even connected hammers ( or something ) on every stalagtite in a cave and plays the CAVE ( !!! ) with a keyboard

Check it out definetly :

Main Page :

Library :