One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Rising from the sea like a stone monster.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

The patch of land below the memorial was gifted by the British to the United States.

The final resting place of hundreds of Polish airmen who died fighting the Nazis in Britain.

The only electricity pylon under whose legs you can go by boat.

A large piece of modern art makes this roundabout the only one in the world with its own laser.

This little-known hero has been protecting "The Fens" for close to 400 years, and now from its most powerful challenger yet: climate change.

The rusting relics of Southampton's former luxurious flying boat industry.

The tallest freestanding structure in the United Kingdom.

Peek inside restored planes at this off-the-beaten-path collection of aviation archaeology.

Rare remnants of the brick-domed ovens birthed in the Durham coalfield during the Industrial Revolution.

Locals spent years successfully fighting to save this beloved Brutalist behemoth from demolition.

This striking steel sculpture transforms environmental data into art.

A disastrous D-Day rehearsal was relatively unknown until this sunken tank was discovered 40 years later.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

A clumsy-looking flying locomotive rusts within sight of a busy rail station.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.