A historic neighborhood church is reborn as a psychedelic arts collective.

Largest Roman Catholic church in North America.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

These abandoned grain silos and tunnels are an urban exploration dream.

An abandoned outdoor movie theater in the Sinai desert.

These otherworldly formations were shaped over millions of years by the forces of nature.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This hidden gem is bathed in beautiful natural light.

An abused and forgotten metropolis, abandoned for centuries.

World's first "penitentiary," meant to be humane, drove men insane.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

An Italian hillside ghost town.

An abandoned desert hamlet swallowed up by sand.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

The tangled roots of a giant banyan tree have fully reclaimed the ruins of this abandoned warehouse.

Once the most densely populated place in the world, this island is now a ghost town.

The remains of diamond fever taken over by the desert.

It seems that the residents of of this megalopolis suddenly vanished, but they were never actually there.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This abandoned fishing settlement may well be the greenest village in the world.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.