There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

These ruins of a medieval church are full of architectural mysteries.

This strategically placed hill fort has served defensive forces from the Iron Age up until the 20th century.

Legend has it the famous Robin Hood would attend mass at this 12th-century Cistercian abbey in Sherwood Forrest.

This historic franken-chapel is the oldest wooden church in the world, at least part of it.

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

This 1,300-year-old marker is one of the finest and most complete early Christian crosses in Scotland.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.

A thousand year old oak tree survives in Liverpool.

This repurposed church offers a more literal way to get closer to the heavens.

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

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

A reportedly haunted 14th century church is curiously facing the “wrong direction.”

This ruin in a suburban park may be the place where Shakespeare's "A Midsummer Night's Dream" was first performed.

The intended purpose of this unfinished Elizabethan building remains a mystery.

This ruined folly was originally built to honor a failed American state that would have become "Westsylvania."

Museum celebrating the history of computers, especially their role in codebreaking.

The oldest library in Scotland was built from the remains of a church to hold a churchman's library.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

Part museum, part piece of Arthurian-inspired history, this stately hall attracts King Arthur fans from miles away.

The oldest working mechanical clock in the world.