Surreal riveted sea forts once protected the Kent shores from German attack.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

The remnants of an early American attempt at missile defense.

Retirement home for giant obsolete machines.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Rising from the sea like a stone monster.

This abandoned fishing settlement may well be the greenest village in the world.

Bohol's mysterious brown hills.

An explosion of natural color known as "the river that ran away from paradise."

An ocean in the making, in the Ethiopian desert.

Walk in the footsteps of the gods and straddle two tectonic plates.

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This Scottish bridge seems to compel dogs to leap to their death.