A spiralling hourglass-shaped tower rises from the forests in Denmark.

An exhibition of preserved locomotives housed in a 1950s depot shows the history of Denmark's railway.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

A decaying, yet still functioning, work of communist architecture.

The social hall of this former factory is a Communist-era time capsule.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

Rock carving created 1,300 years ago 75 feet off the ground.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

UNESCO-protected ancient burial ground.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A collection of art from Bulgaria's time as a communist state.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

The world's northernmost brewery uses water from a 2,000-year-old glacier to create its beer.

Cold storage for agricultural biodiversity.

This Arctic mining town is home to a cat that's spent years masquerading as a fox.

One of the most iconic neon ads of former East Germany.

This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.