The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Roadside tribute to a staple of eastern European cuisine.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

This unusual building straddles two countries.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

A seemingly simple canyon that was the backdrop to a number of famous movies.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The early American colonists were such ferocious drinkers the law actually required every town to have a tavern.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

The only house built with a turret, crenellations, and a moat in Palmer, Alaska.

This junkyard made over as a theme park is the "Most Alaskan place in Alaska."

An auroral research program that superheats the ionosphere.

The facade of this relic from the Klondike gold rush is decorated with over 8,800 pieces of driftwood.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

A giant poultry statue immortalizes one of Alaska's more humorous town names.