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

Banksy's image of a naked man dangling from the window of a sex health clinic.

A remarkably intact castle that once was the largest in Ireland.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This 15th-century fortification was built to defend bunnies.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

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

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

This eclectic sanctuary is a hodgepodge of various architectural styles, all crammed into one building.

Largest lake in Great Britain measured by surface area.

Rebuilt remains of a temple to Roman god Mithras.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A remarkable medieval structure born from a 14th-century disaster.

One of the U.K's earliest public water supplies is within the "plague village."

Eyam took steps to quarantine themselves and keep the plague from spreading.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

This abandoned Greek island was the last active leper colony in Europe.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.