This tiny patch of arid sand sits in one of the greenest states in the United States.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

A set of medieval stained-glass windows tell the gruesome story of a Viking siege.

One of England's most famous churches hides a pair of little known architectural treasures.

This skewed English house has looked like it's going to fall over for centuries.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

A "Texanic" (gigantic Texas) collection of Art Deco architecture at Dallas' historic Fair Park.

The bizarre headgear looks like it was made for a fool, not a king.

A beautiful geyser under environmental threat.

Northern Ireland's Brobdingnagian stepping stones.

Famously misunderstood wonder of the ancient world

Elevated freight railway turned wildly successful urban park.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

The massive machine creates cracking displays of indoor lightning.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

This stone complex marks the urban center of a lost civilization.

These ruined Incan mausoleum towers still bear carvings of sacred animals on their blocks.

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

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

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

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.