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

One family's environment-friendly hobbit-house in Wales.

This aircraft museum is home to one of just three Halifax bombers in the world.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

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

The sanctuary seems to either float atop the water or sink into the dirt, depending on the water level.

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

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

The remains of centuries of copper mining appear like an alien landscape.

These legendary stone steps were once used to haul coffins up the rockface.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

What was once England's second-richest abbey is now a haunting ruin.

Abandoned for over 20 years, this art deco seaside swimming pool is a magnificent waste.

A beautiful medieval bridge allegedly constructed by the Devil.

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

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

A petite castle folly in the English countryside.

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

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Once the largest factory complex in all of Europe, this converted shopping center celebrates its industrial past in a big way.