These imposing walls and towers look more like the ruins of a fortress than a monastery.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

Ship-sized kinetic sculptural fantasy.

The medieval woodcut-style artwork chronicles life in medieval London.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

You can spend the night in Dr. Frank-N-Furter's castle.

At just 51 feet and 10 inches long, it's the shortest street in England.

A hugely vast Irish landscape of barren rock that stretches for miles.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

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

Another entry into the world of Edinburgh's pop-up artworks.

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

A poetic monument to the Scottish Parliament.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

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

This working class sculpture pounds his hammer all the livelong day.

A beautiful final resting place for some of the noteworthy deceased.

This nondescript building hides an entrance to an underground nuclear tunnel system.

An abandoned canal route lies hidden under the streets of Manchester.

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.

Manchester's abandoned train depot lingers in a post-industrial purgatory.

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

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