This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

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

The most loyal of little dogs, or a Victorian era publicity stunt?

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

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

The fountain marks the area where hundreds of accused witches were burned at the stake.

Northern Ireland's Brobdingnagian stepping stones.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The modern birthplace of Irish freedom.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

The ancient tomb acts as a calendar that keeps perfect time.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This ancient theater was once the home of fierce gladiatorial battles.

A unique underground structure dating back to the 1st century BC.