Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

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

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

A sweet symbol marks the place where torturous executions were once carried out.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This small museum in a 17th-century building honors three iconic Scottish writers.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

In Kazakhstan, a colorful cathedral with many lives once survived the most powerful earthquake in the region.

Britain's only herd of free-ranging reindeer.

The unbelievably opulent home built for an infamous newspaperman.

The petroleum industry brings you the joys of hydrocarbons and largest collection of antique oil rigs in the world.

The final resting place for the remains of 143 Habsburg royalty.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

A contemporary fresco movement illustrates the region's rich history.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

Granny Smiths and Fujis can both be traced back to Kazakhstan, where apples still grow wild.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

Controversially claiming the title of world's biggest bass drum, UT's Big Bertha was once made radioactive by the Manhattan Project.

A 24-hour vending machine restocked daily with homemade full-sized pecan pies.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.