Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Remnants of a forgotten 1920s speakeasy and Prohibition-era murals were discovered in its basement.

The much-beloved mascot of a local museum.

Here, cows that make vodka are treated like celebrities.

This battleship of a building was designed by a famed "mad architect."

The location of the world's first telescope demonstration.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

Inspired by the famous sculptures on Easter Island, this head serves as a popular meeting spot by Shibuya Station.

This quiet neighborhood is also home to a 700-ton rock transported by the last Ice Age.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

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

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This bronze statue of Martin Luther King was placed in the park without permission.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

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

The once-booming fox ranching industry has left its mark on Prince Edward Island.

A 1995 memorial acknowledges the tremendous contributions of Vietnamese refugees to Canada.

This small enclave plays host to a house, church, and wishing well all composed entirely of recycled glass bottles.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

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

Amsterdam's Red Light District leaves little to the imagination.

Europe's official "zero-level," the equator of elevation.