This temple was constructed entirely by Roman soldiers.

A miniature train-ride through Slovenia's largest cave system.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

The Netherlands' first car tunnel has an unusually rectangular shape.

Yup, that's a 330-foot yacht passing over the highway.

Most prolific publishing house in the 1600s open to the public.

An open-air sewer system that was covered piece-by-piece over 300 years.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Did Inca children also slide down these smooth rocky slopes above Cusco?

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

The largest 19th century panorama in the world still in-situ.

A 1:20 scale piece of the Netherlands commissioned by a queen lets visitors take a stroll as giants.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

A miniature city, once ruled by the Queen of the Netherlands.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Incredible labyrinth of man made caves.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.