This artificial lake surrounded by Brutalist architecture served as a stand-in for futuristic Britain in Stanley Kubrick's 'A Clockwork Orange.'

The Great Fire of London and the regulation of one-way streets both started in this alley.

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

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Where condemned pirates met their grisly end at the gallows on the River Thames.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Nestled atop a wind-swept crag in the Scottish Highlands is a lonely memorial to a beloved hiker.

A pagan tradition of draping trees with rags eerily lives on.

The oldest church in Inverness witnessed the brutal executions of many Scottish soldiers.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

A rare permanent monument to the Scottish Travellers.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

This mundane post marks the old location of the city's main postal hub.

A sculpture in a secluded garden honors one of Edinburgh's most innovative thinkers and city planners.

This historic timepiece was a popular meeting place for romantic rendezvous in the 1960s.

The artwork mysteriously appeared within an Edinburgh cemetery.

This unusual statue overlooking the Royal Mile has an interesting backstory.

This was once a hall in which a 16th-century royal banquet was hosted by King James VI of Scotland.