This work of engineering is imbued with elegance and ingeniousness.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A series of playful yellow penguins share a serious message about the environment.

This Transylvanian church has changed its denomination four times.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Inside this metro station is a section of the city's former medieval fortification.

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

The world's longest wildlife overpass provides Hilversum's critters with a safe alternative to trying their luck on the roadway.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

Likely the first car with an internal combustion engine constructed in the United Kingdom.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

This five-foot-tall bronze bird is a memorial to a species that was hunted out of existence.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

This beautiful, historic church looks like something out of a simpler past.

Outlaws, hot springs, and tragedy have all left their mark on this ancient road in the Icelandic highlands.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

The summer tourists on these cliffs are thousands of seabirds.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The oldest church in Iceland is one of the few to feature ornate decoration.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.