A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

A relic of Victorian grandeur hides beneath a busy South London road.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

A curious collection of mechanical moving figures.

Follow the original medieval paths that wind through this intriguing section of the city.

Scotland's only funicular railway is also the United Kingdom's highest.

A Roman spa buried deep beneath the City of London.

Grab a cuppa at England's first and only domestic tea plantation.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

This secluded walkway overlooks a magnificently wild London green space.

The stately remains of Llywelyn the Great's mighty fortress.

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

This foolish Victorian sea fort was converted to a deluxe hotel.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Charles Babbage's proto-computer, painstakingly brought to life.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

The forest that inspired Winnie-the-Pooh's Hundred Acre Wood can be found outside London.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.