One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A collection of more than 10,000 racist objects that teaches the atrocities of social injustice and intolerance in American history.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Former self-sufficient mental institution now a planned community.

The world’s largest Masonic temple was saved by the White Stripes.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

Strange physical sensations and optical contradictions keep visitors coming back for more.

Island where motor vehicles are banned -- home to the only carless highway in the United States.