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

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The remains of the wrecked steam trawler can be found on the beach at low tide.

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

This beach runway is off limits during high tide.

Legends say that this small island was the final resting place of the Welsh saint of lovers.

A tiny, hidden alleyway dedicated to the father of meteorology.

One of Edinburgh's oldest pubs hides a 19th-century skittles alley in the back.

A 19th-century time capsule of travel, fiction, and historic texts still available to the public.

Ancient human remains unearthed around the iconic monument.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The colorful stairs are made with marble from the world's major quarries.

In the ruins of Glastonbury Abbey lies the alleged resting place of the legendary king.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

A secret door leads to this cozy dive that sells only “milk.”

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

The longest and tallest aqueduct in Britain can actually be sailed across.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

A whale's jawbone and a malfunctioning harpoon welcome you to the village of Bragar and its lore.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Where the sleeping monsters of Scotland's oil industry are left to rust.

This skewed English house has looked like it's going to fall over for centuries.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.