This former quarry is now a picturesque gorge that hides a sunken lake.

A concrete plant shaped like four giant soldiers commemorates one of the most decisive battles of the Napoleonic Wars.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

A World War II gun battery sits at the easternmost point of North America.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

Danish observation tower designed to look like a giant beer bottle.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

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

Hans Christian Andersen for the postmodern world.

The deepest metro station in the world.

340-foot statue built to honour the Heroes of the Soviet Union.

Padlocks cover this rickety footbridge with love.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

What was once a bustling mining installation is now a bustling hub of contemporary art.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This "floating railway" is one of the world's oldest monorail systems.

An eerie, derelict amusement park in Berlin.