A popular swimming hole that hides one of America's most deadly diving spots.

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

An abandoned jewel of a ballroom on the top floor of Australia’s busiest rail station echoes with the sounds of a bygone era.

Australia's only intact colonial warship never saw action before being turned into a scenic wreck.

Two stunning 17th-century libraries and a cabinet of curiosities.

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

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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

Sacred Indian temple that’s all monkey business.

Hot springs monkey spa in the middle of Hell's Valley.

Continuing the tradition of the dime museum in style.

A curious collection dedicated to human and animal anatomy and pathology.

A 200-year-old prison that now houses a peculiar crime museum.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

World's largest collection of serial killer artwork and other macabre exhibits.

The morbid items in this small and hidden museum are not for the weak stomached.

Clusters of huge boulders in the Australian Outback.

Australian museum dedicated to human health and lack thereof.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

A stray meteor left this picturesque hole in the Australian outback.

The word 'wunderkammer' translates as 'wonder-chamber'. This Wunderkammer is both a museum and a retail store.

A clear example of the process of erosion in action.