A hip bar decorated with walls of golden skulls.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A haunting tribute to pioneering photographer Clover Adams.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

This grand gothic brewery has been pumping out suds for over a hundred years.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Renaissance villa and gardens complete with a tormented colossus.

Secret refuge and museum of the Duke of Florence.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.