This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A tribute to Loveland’s most famous sweethearts, who helped spread cupid’s message to millions.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

One person's lost luggage is another person's treasure.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This soviet pilot's graveyard is filled with headstones made of airplane fins.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This legendary dessert was served to Nobel laureates for decades.

A concrete mushroom that divided Stockholm residents for nearly a century.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

Frequent fliers welcome in this airplane hotel.

A floating underwater hotel, created by a Swedish artist.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

This Stockholm light tower can be controlled by anyone with a smartphone.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

The saddest little diner in New York.

Three-story slide through the New Museum.

One of the only single-person private gravesites in New York City.