Elaborate series of tunnels where traces of mass suicide are still visible.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

Frequent fliers welcome in this airplane hotel.

It houses the remains of a 17th-century version of the Titanic.

A modern Nordic Pompeii on the Icelandic island of Heimaey.

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

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

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

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

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

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

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

This elegant arc of a waterfall marks a religious turning point.

The most powerful waterfall in all of Europe.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This church looks more like a spaceship than a house of worship.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

These ramparts, once lined with towers, were constructed in defense of Beaune.

This French chateau is home to the world’s largest private collection of fighter jets.

One of the most poignant ruins of the Chornobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chornobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.