A Circus legend leaves an unexpected endowment.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

This statue inspired by Renoir's famous painting embodies the jovial spirit of Key West.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Former villa and estate of James Deering developed to preserve native tropical forests.

Four metal statues of massive animal penises stand outside the university's Animal Sciences building.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

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

One of only two commuter aerial tramways in the United States.

A crumbling hospital from the 1850s on Roosevelt Island.

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 bit of retro transportation flair preserved in the world's largest department store.

Elevated freight railway turned wildly successful urban park.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.