Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Ancient burial grounds of the wealthy.

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

A six-ton wedding present for the King of the Scots.

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

The world's largest collection of witchcraft regalia.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

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

Rebuilt remains of a temple to Roman god Mithras.

Black cat statues guard this temple-like Egyptian revival factory.

Charles Babbage's proto-computer, painstakingly brought to life.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Follow the original medieval paths that wind through this intriguing section of the city.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A museum wholly devoted to juvenescence.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

An abstract monument to a symphonic composer.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

Ancient human remains unearthed around the iconic monument.

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

This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

The intended purpose of this unfinished Elizabethan building remains a mystery.