The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

An emerald-green grotto just a short trip from Austin.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A Roman spa buried deep beneath the City of London.

A haunting painting meant to capture the calamity of World War I.

This mysterious and unique painting is filled with symbolism.

The ritual has been performed uninterrupted for nearly 700 years.

Ship-sized kinetic sculptural fantasy.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

One of the world's largest collections of pathological specimens.

An architectural oddity hides in plain sight on this iconic London bridge.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

The fences outside some of South London's estates are made from recycled World War II stretchers.

Putting the "mod" in "modular" since 2000.

A wonderfully preserved example of London's 1960s-style high-density, low-rise public housing.

This medieval church is the only one in the world that features all Marc Chagall stained-glass windows.