This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A glacier pocked with ice caves and surrounded by rainforests.

An abused and forgotten metropolis, abandoned for centuries.

Detailed facade of a brownstone in Boerum Hill.

A Prada store in the West Texas desert that is never open for business.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

This series of Scottish caves has no clear purpose other than baffling historians.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

The final resting place of the poets Shelley and Keats.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

Frida Kahlo's childhood home, now a museum of her life and works.

One of Japan's most famous sights, the bridge was originally built in 1673.

Only known mainland rookery of the threatened Stellar sea lion.

A sunken idol welcomes parishioners to Davy Jones' Locker.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

An eccentric folk art landmark made out of discarded bottles by an inspired "grandma."

"There's nothing there," and other lies the KGB told us.

This "floating railway" is one of the world's oldest monorail systems.

This historic stone bridge has an entire neighborhood clinging to its sides.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.