A subterranean playground in an abandoned slate mine.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.

Scotland's only funicular railway is also the United Kingdom's highest.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

In the right conditions a wall of water up to five feet tall flows upstream against the current on the River Trent.

Over 100 years ago this pyramidal holding cell was reserved for rowdy drunks but now only offers five minute sentences.

Every year locals tumble 650 feet down to the bottom of the hill chasing a Double Gloucester cheese.

One of the last doorless, continuously moving elevators still in use in the U.K.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

The storied English village that pretended to be insane inspired NYC's nickname and the fictional namesake in the DC Comics universe.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

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

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

Hidden beneath the streets of London is a secret subway that only carried mail.