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.

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

Once disputed as the largest sundial in the world.

World's largest collection of serial killer artwork and other macabre exhibits.

A self-funded cemetery with a long list of inhabitants.

A semi-scholarly approach to sex.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.