Unfinished monument to peace between Turkey and Armenia, long divided by a dispute over genocide.

Underground monastery and fortress.

A museum glorifying the life of Stalin, located in the city of his birth.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

A gleaming white and undulating tower marks the border between Georgia and Turkey.

Europe's highest peak is a key pillar of the Seven Summits mountaineering challenge.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

You would never guess that before World War II this lonely field was a bustling German city.

The pyramid and dome deep inside the Dzūkija forest are believed to channel divine energy.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

Open-air museum with a large collection of Soviet-era statues.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

A model village fit for an emperor.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

Stunning examples of Russia's 18th-century wooden architecture.

An abandoned town of skeletal wooden homes.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

This former limestone quarry is now a subterranean wonderland of grand stonework.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.