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

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A museum within a museum, devoted to history's most questionable medical devices.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A wall of chewing gum moonlights as collective art.

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

World-famous, Pink's still manages to keep its prized cult fetish status.

See massive fossils that are over 200 million years old in northeastern Arizona.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

One of only two commuter aerial tramways in the United States.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Hear the quietest sound from across the dome.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Historic funicular railway, believed to be the shortest railroad in the world.

The middle finger of modernity.

Canyon walls shrouded in ferns.