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

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Formerly abandoned underground complex to keep royals safe from a nuclear war that never came.

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

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The longest hedge maze in the world.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This 1920s Dutch barge is now a floating bookstore.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

These fantastically named natural pools look like something out of a Scottish myth.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Dynastic Home of the De Piro Family.

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

A centuries-old forgotten underworld lies beneath Malta.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Beatlemania is still going strong... at least in Kazakhstan.

The beautiful 16th-century stepwell lies in the shadow of a famous fortress.

This small cafe aims to empower acid attack victims and stop violence against women in India.