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

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

In a small courtyard resides this large mural that draws inspiration from Leeds and its history.

A renovated henge and stone circle just south of Stanton Harcourt village.

The largest known medieval map of the world.

A miniature village mimics the surrounding buildings so well it includes itself.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

A majestic mansion designed in Mughalai style, complete with a turquoise onion dome.

A petite castle folly in the English countryside.

Collection dedicated to brands, packaging and advertising.

The television series' iconic giant foot was borrowed from this classical painting.

Colorful and chaotic stacked hotel in North Holland.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

On a site with a long military history, a 1980s shelter.

This massive chalk hill carving is one of England's most beloved giant horse geoglyphs.

The longest hedge maze in the world.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

Unusual British home built to disguise a water tower.

One of the best-preserved, yet least visited stone circle sites in Cumbria.

The abandoned transportation hub hides within the Glasgow attraction it once served.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Giant statue of a disembodied head.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

Enormous terracotta heads of Queen Elizabeth and Prince Phillip can be seen on the side of the road to Windsor.