A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The largest and most famous wax anatomical collection anywhere in the world.

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

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

Museum preserving torture methods from the past.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Tiny memorials honor individual victims of the Holocaust.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A surreal museum of extraordinary industrial objects.

Home to three historic ships from the age of Vikings.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The design of this beautifully crafted building was inspired by Norwegian glaciers.

A hotel and restaurant serving as the mecca of kitsch.

Huge otherworldly domed rocks on the shore of a deadly lake.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Version of the French Riviera destroyed by the sea.

The ghostly remains of an accidental sea.

California's oldest wind harp represents a historic piece of America's Danish history.

One of the ghostly stops along Route 66.