Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

The headquarters of the famous Yale society.

A dark Victorian well house now plays host to mystical waters and pagan shrines.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

This Georgian Gothic building was created to shelter and feed deer.

The nearly 200-year-old folly has a secret spiral staircase hidden in one of its pillars.

An abandoned tower once used to study the cosmos hides within a thicket of greenery.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

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

The modern birthplace of Irish freedom.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

An abandoned Incan construction project left behind a mysterious "doorway."

The Uros people live on floating reed islands in lake Titicaca.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

It took 82 years and four different plaques to finally get the story right.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

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