Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

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.

The largest greenhouse in the world is home to over one million types of plants.

The remains of Crystal Palace Great Exhibition of 1851.

A fantastic castle rumored to be the birthplace of King Arthur.

400-year-old garden, restored to beauty.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The longest hedge maze in the world.

An unusual round church in London with a Templar past.

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

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Famously misunderstood wonder of the ancient world

The world's largest collection of witchcraft regalia.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

The castle where the Marquis de Sade lived out his darkest fantasies.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This ancient theater was once the home of fierce gladiatorial battles.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.