One of the oldest and certainly best preserved Cistercian abbeys still in existence.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

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

A open air theatre built on a cliff by an eccentric British woman.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

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

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The heads of two giant mythological water horses honor Scotland's horselord past.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Protecting the dead from opportunistic body snatchers.

The most loyal of little dogs, or a Victorian era publicity stunt?

This 13th century castle is chock full of ghosts and impossibly rare cows.

Famously misunderstood wonder of the ancient world

The first archaeological site discovered by aerial photography.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

The curious underground history of keeping Paris clean.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Ancient mysterious ruts carved in the bedrock.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.