This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’

Two standing giants remain as a tribute to Luxembourg's metallurgical past.

An exquisite panometer representing Dresden as it was from 1695 to 1760.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A subterranean house of worship carved right out of the bedrock.

During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

Walk through Czech history in Prague's largest graveyard.

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

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

This abandoned Belgian fortress is purposefully being left to nature.

The oldest cemetery in Belgium.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

A statue of Vladimir Illyich Lenin guards this abandoned building in the "Forbidden City."

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Terrifying derelict military hospital once housed a recuperating Hitler.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

A church of bones, decorated with 40,000 human skeletons.