A historic observatory precariously perched at the "Top of Europe."

The second-highest train station in Europe.

Visit Europe's largest subterranean waterfall, carved by water from the glaciers of the towering peaks surrounding the valley.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

Liechtenstein's royal family calls this medieval alpine castle home.

A unique bridge with an equally unique view.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

Go surfing on this urban wave, "hacked" by local surfers.

Amsterdam's former hotspot for public executions and dissections.

Where royalty waits in the height of luxury.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

These public toilets also provide entertainment for visitors to Amsterdam’s Red Light District.

The history and future of cannabis.

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

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

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

A beautiful maze marks where three countries meet.

The highest point in Belgium is a staircase to nowhere.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

A swath of France so devastated by war it is still forbidden to go there.

Site of one of World War I's most horrific scenes.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

A team of concrete athletes stands in the middle of a traffic circle.