This innovative steam machine was no doubt the most famous of the pioneer locomotives.

Belfast's namesake river still winds below the city center, hidden from sight.

This tallest folly in the world began its life as an elaborate factory chimney.

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

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

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

Lord Byron's embalmed body lies within this medieval church.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

Britain's tallest megalith towers over the cemetery of a quiet English village.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

Quirky Welsh observatory unites art and science.

Putting the "mod" in "modular" since 2000.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

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

You will not be able to miss this building.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

Modern commuters still pass through this 2,000-year-old Roman archway.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

“It has nae lugs!”

Legends say that this Art Deco apartment building almost became Hitler's British headquarters.