This World War II relic let Allied pilots know they were entering neutral airspace.

This hidden workshop is filled with molds of France's most iconic sculptures.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A meandering boardwalk across the bogland leads to a "stairway to heaven" with sublime views.

This communist country can still appreciate its fragrant past.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

In terms of history and architecture, this is one of the most remarkable cemeteries in the world.

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

The atmospheric road was never meant to be so creepy.

A museum marks and documents the site of the Titanic's launch.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This gnarled old tree supposedly sprouted from seeds kept in the pocket of a 16th-century Spanish sailor.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Elvis's own personal tropical hideaway.

Mass graves and Victorian monuments mark the history of Memphis in this 19th century cemetery.

An unknown Hall of Fame in Jackson, Tennessee.

This homegrown adoption center offers a wonderland of feline companionship.

This historic train station has been converted to a locomotive themed hotel.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.