Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The famous author's cottage hideaway.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

The studio of influential composer Charles Ives is perfectly reconstructed, hidden in the back of the American Academy of Arts and Letters.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

This was one of the first (and last) university-built and operated nuclear reactors.