An enormous concrete structure built over a nuclear crater.

An abandoned relic of the city's failed experiment with below ground transit.

These crumbling Latvian forts make for some haunting seaside ruins.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

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

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

Unused mast taller than every structure in the EU.

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

An Industrial Revolution-era public work that purified water using nothing but sand.

These abandoned waterworks are crumbling into the Potomac River.

A dormant lightning machine equal to all the power in Russia.

Stalin's prisoner-built rail line sits in ruin, never having a single car ride its tracks.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Rusting railcars and locomotive equipment fill this Ethiopian train graveyard.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

These cinderblock farmhouses were actually World War II radar stations in disguise.

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

These phallic stone spires once served as Tolkien's Paths of the Dead.

World's oldest and largest space launch facility, once a secret missile testing site.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

A place as enchanting as the journey to reach it is harrowing.

The remains of a historic ranch house that witnessed the Civil War battle dubbed the “Gettysburg of the West.”

This tiny little island has, as the name says, just enough room for its single house.