A tumbling waterfall near a narrow passage that was used to herd cattle for hundreds of years.

A rare survivor from the age of plagues.

All that remains of the medieval palace of the famous "Black Prince."

The world's largest collection of preserved trolleybuses.

A single oak tree rises out of the waters of Loch Lomond.

Although it appears much older, this castle-like tower is actually a Georgian-era folly.

A museum dedicated to the tragedy of Bloody Sunday.

A beloved upside-down beacon off the coast of Northern Ireland.

A well-studied colony of endangered bats roosts in this abandoned Victorian Gothic mansion.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

The adorable animals return to this nature reserve every fall to give birth to their pups.

One of the oldest remaining Catholic churches in England is home to the hand of a 7th-century saint.

The former home of the world-famous Templeton Carpet Factory.

A poignant memorial shows the widows and children left heartbroken by the worst fishing disaster in Scottish history.

The remnants of a facade from a 19th-century market stall emporium.

The world's only managed flock of mute swans was established as a factory for monk meat but is now an adorable sanctuary.

The home of an eccentric Edwardian gentleman is packed to the rafters with handcrafted items collected over a lifetime.

This Georgian architectural masterpiece is the only cloth hall left in Britain.

These quaint cottages feature built-in signaling devices for fishermen.

The ruins of a Roman fort lie in the shadows of an imposing medieval castle.

This inn of the court provides a fascinating window into London’s legal and architectural history.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

A double cantilever system bridge that was designed to prevent flood damage.

A mysterious, weather-beaten bus lies on the coast of Harris, enticing the curious to investigate.