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

The oldest surviving synagogue in New York City is now a soaring art space.

An extraordinary mixture of natural beauty and man-made phenomena.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

Stalactites and stalagmites in a beautifully lit cave.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

A massive underwater sinkhole made famous by Jacques Cousteau.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

An abandoned relic of the city's failed experiment with below ground transit.

A meditative space out of a fantasy story.

An incarceration museum on the spot of possibly the oldest prison in England.

A collection of abandoned typographic signs from Berlin and beyond.

This historical theme park celebrates all things noodle.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A wunderkammer of mysterious objects and stories.

Pompeii's less famous neighbor is still revealing her secrets.