In the U.K., a historic workhouse shines a light on the early, harsh treatment of the poor.

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

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

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

At night, the enormous sculpture looks like a UFO hovering above the English hills.

A stretch of land where the sour-sweet vegetable is cloaked in darkness and grows so fast you can hear it crack, squeak, and pop.

This Victorian marvel of engineering and artistic prowess is nicknamed the "Cathedral of Steam."

Inspired by a dream, a hermit carved out a home in this sandstone bank to live a life of contemplation and prayer.

The remains of a historic kiln once used to produce the famous Rockingham porcelain.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

This jewel of an engine is one of Northern England's finest surviving legacies of the Industrial Revolution, even catching the eye of Henry Ford.

A poignant memorial to the 106 coal miners killed in three major accidents in Derbyshire.

A unique 1980s designed church sits uncomfortably in its traditional Victorian churchyard.

This old Victorian bathhouse is fed by an ancient spring.

A repurposed railway tunnel with otherworldly acoustic characteristics.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

The world's first successful water-powered cotton mill paved the way for the factories of the British Industrial Revolution.

A headstone notes where the most famous of Robin Hood's legendary Merry Men is reportedly buried.

A tiny, heartwarming piece of art hiding in plain sight.

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

Semi-precious Blue John stones have been mined in this cavern system for centuries.