19th century tunnels burrowed under Liverpool.

This skewed English house has looked like it's going to fall over for centuries.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

This dreamy street will transport you to wintertime in Victorian England.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

These ornate arches show how the course of the River Thames has changed.

An architectural oddity hides in plain sight on this iconic London bridge.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

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

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

A petite castle folly in the English countryside.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A magnificent winding road through a steep valley, with deep natural caverns at the bottom

The Liverpool street made famous by the Beatles is real.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

Each spring this woodland floor is carpeted with purplish flowers as far as the eye can see.

In 1943 the British military took control of this village, telling residents they had to leave temporarily. The villagers were never allowed to return.

This antique prison is a tourist attraction with a sordid past.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

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

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.