The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

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

The atmospheric road was never meant to be so creepy.

Northern Ireland's Brobdingnagian stepping stones.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Scattered throughout London are ancient remnants of the city's former bounding wall.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This one has sailed five times as far as Sir Francis Drake's famous ship.

London's smallest police station is barely the size of a phone booth.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

The world's largest wooden structure.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

An ancient Egyptian temple in the middle of Madrid, Spain.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Stolen goods adorn the organ at Old North Church.

A mysterious stone embedded at the base of a historic Boston building.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The site of Paul Revere's historic two lantern warning.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.