These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The beloved bard's garb is proudly displayed within a Freemason's hall.

Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

A holy well supposedly infused with a saint's spirit flows within this quaint chapel.

This ruined 15th-century hermitage is steeped in myth and mystery.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

The oldest botanical garden in the world that technically isn't the oldest.

The world's oldest surviving anatomical theater, where "the dead are pleased to help the living."

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

Commonly acknowledged as the only public monument to the Devil himself.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Protecting the dead from opportunistic body snatchers.

The world's first experimental nutritionist is memorialized as the "Hippocrates of naval medicine."

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

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

A tiled, multi-level garden of survival in Lyon.