Summer in Scotland begins with a spectacularly wild and colorful event rooted in ancient pagan traditions.

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

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

The fountain marks the area where hundreds of accused witches were burned at the stake.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

An Irish peat mine has become a stunning sculpture park.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

A massive Celtic cross secretly growing in an Irish forest.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

The oldest licensed distillery in Ireland.

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

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

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

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

When the rain falls, this drain system turns into a musical instrument.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

This unusual elevator doesn’t stop or slow down.