The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

Illegal drag racing two stories beneath Chicago’s streets.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

142 ceramic steps become a mosaic once a year.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Cavernous opening completely encased in Karst limestone.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!