Apartment complexes built into huge repurposed natural gas tanks.

Of all the houses that grace this neighborhood, only one is a testament to surreal architecture.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

The abandoned military base looks like a post-apocalyptic wasteland.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

A once-fairy tale mansion now stands in a state of disrepair.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This man-made mound monument was built out of soil from all across the Polish empire.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

An underground city of salt.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A collection of intricate sculptures so small they have to be seen through a microscope.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

An abandoned cable car station located on the Danube stands like a haunted house above the river.

The massive white mound and accompanying water terraces are a striking geological oddity.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.