The tallest mountain in mainland Netherlands isn't actually very tall.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This little patch of Europe remained neutral for more than a century because of a mine.

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

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

Single runway interrupted by a busy road that cuts across its middle.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

A unique seaside cave where Aleister Crowley faked his own death.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Eat the ultimate iteration of Portugal's most beloved pastry.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

The world's oldest bookshop still in operation.

Sip cherry liqueur at a bar dating back to 1840.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

This unassuming stone bollard is a centuries-old marker denoting the center of the city.

Banished from town, this local jester concocted a clever return.

An installation that makes understanding the size of the universe a walk in the park.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

The bridges portrayed on EU currency aren't fictional anymore.