Notorious artist squat renovated into legal studios.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Mountain where Jesus was first tempted by the Devil.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

This semi-secret storybook hedge maze is also the oldest garden in the city.

Unlock the secrets of the conjuring arts.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

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

Try not to get slimed in Tribeca.

A hip bar decorated with walls of golden skulls.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

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

This railroad overpass is said to be home to a murderous goat-man whose very legend has led to very real deaths.

A suspended garden, now gone, once hung in the middle of this abandoned church.

An art deco ice cream shop covered in vintage train station tiles.