Amsterdam's Red Light District leaves little to the imagination.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

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

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

On Japan's Tashirojima Island, cats are king.

An ancient rock engraving shows Aboriginals used their advanced knowledge of the stars to hunt and gather.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The television series' iconic giant foot was borrowed from this classical painting.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

If Hello Kitty were Mickey Mouse, this would be Disneyland.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

The original "capsule building" is a masterpiece of Metabolist architecture.

The remains of diamond fever taken over by the desert.

A fifth-century temple improbably built into the side of a cliff.

Walk 2,300 feet above the ground on the "Troll's Tongue."

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.