This Scottish bay still reveals evidence of its days as a seaside swimming pool.

This giant wooden treehouse within a sprawling garden has its own eatery.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

An abandoned Yorkshire castle that is hidden in plain sight.

In the U.K., a historic workhouse shines a light on the early, harsh treatment of the poor.

This king penguin is a knighted brigadier of the Norwegian Army.

Journey through one of the oldest industrial sites in Scotland.

Visible at low tide, this rusting vessel is one of the last surviving examples of the X-Class "Midget" submarines.

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

This English medieval castle is where King John died of dysentery.

The remains of the concrete ship can be seen during low tide.

This former lifeboat house now used by a funeral service was the site of a 19th-century boating tragedy.

One of the oldest amusement rides in existence was a huge disappointment to its creator.

This restaurant was removed from the famed sister ship of the Titanic and placed within a hotel.

At high tide this strange footbridge appears to have no purpose whatsoever.

Sail in for a ’dam good slice.

This dreamy street will transport you to wintertime in Victorian England.

This 19th century police station now puts the history of the Manchester City Police on display.

This disused Cold War bunker has been restored to all of its early 60s glory.

Makers and sellers of the original and finest York Ghosts.

This remarkable building has a lot to offer, even if you're not placing a bid.

At 1,732 feet above sea level, this spectacularly isolated yet surprisingly bustling bar is the highest pub in Britain.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.