A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

Atop this former dutch railway office sits an interstellar work of art.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The heads of two giant mythological water horses honor Scotland's horselord past.

This "floating railway" is one of the world's oldest monorail systems.

The highest point in Belgium is a staircase to nowhere.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

The longest staircase lock in Britain.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

This sculpture in Valencia features 22,000 tiny, obsidian blue figures that pay homage to the Lady of Elche.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

The last bastion of Roman presence north of the Alps looms over a German town.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

A medieval gate once used as a prison and how home to a city museum.

The main residence of the Erskine family and the hereditary keeper of the nearby royal Stirling Castle.

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The world's shortest street was created by an awkwardly placed hotel.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

The largest airborne operation in history was launched to capture this bridge.

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