Rome's ancient Etruscan rival, now a park full of ruins.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

2300-year-old Roman road connecting the empire.

A homage to the King at the hotel where he revived his career.

This vintage animatronics show is the Vegas version of a walk through the woods.

The highest bridge in America was built for an almost unnervingly small amount of money.

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

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Elvis's own personal tropical hideaway.

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

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This tiny home was originally a narrow alleyway.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

The world's second largest single-dish radio telescope, once used to contact E.T.

The world's brightest bioluminescent bay.