A surreal museum of extraordinary industrial objects.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

A fascinating insight into daily life in the Eastern Bloc.

An eerie, derelict amusement park in Berlin.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

A open air theatre built on a cliff by an eccentric British woman.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Northern Ireland's Brobdingnagian stepping stones.

A magical place that lets you play in and explore the world of Studio Ghibli.

Opulent downtown movie theater now houses cars as an indoor parking garage.

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

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

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

A crumbling hospital from the 1850s on Roosevelt Island.

Tucked in the back of this amazing antique store is an important piece of medical history.

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