Community bookshelf of 25-foot-tall book spines.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

This is not your typical jungle gym.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

A floating museum that was sunk by a flood and left to rot in the tides.

Less a museum than a bizarre fantasy world created by artists and engineers.