The only surviving piece of Copenhagen's 16th-century defensive wall.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Standing stones found on a construction site are re-erected.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

Swiss vineyards in a UNESCO heritage site.

World's largest permanent maze made of 18,000 conifers.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

Caves famous for the dragon-slaying saint who lived there.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

These spooky and unusual stone formations create an underworldly landscape.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.