The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

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

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

At 207 feet, one of the world's longest continuous escalators.

A former major munitions plant that has been converted into a sprawling art space.

Home to items never before seen by the public.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

The Uros people live on floating reed islands in lake Titicaca.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

The middle finger of modernity.

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

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

The oldest operating pharmacy in the world features 800-year-old recipes.

An out-of-place slice of France, smack in the middle of Shanghai.

France's national museum of scientific and industrial instruments.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Tens of thousands of tiny bottles stuffed with various items.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

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

An artist's mausoleum with a haunting echo.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.