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The Soledar Salt Mines

Some 250 million years ago, a part of Ukraine was under a shallow ocean. When the ocean dried up, it left behind a huge deposit of salt.

Project Riese

Riese is the code name for a construction project of Nazi Germany in 1943–1945, consisting of seven underground structures located in the Owl Mountains and Ksiaz Castle.

The Berlin Wall

The Berlin Wall was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989.

The Kelvedon Hatch: Secret Nuclear Bunker

The Kelvedon Hatch Secret Nuclear Bunker at Kelvedon Hatch, in the Borough of Brentwood in the English county of Essex, is a large underground bunker maintained during the cold war as a potential regional government headquarters.

Excelsior Tunnel

In 1959 it was the centre of project Military Atomic Energy Authority operation orpheus investigating the possibility of masking the seismic signal given out by underground nuclear tests.

RAF Barnham

In the early l950s, RAF Barnham was selected for development as a dedicated storage and maintenance facility for nuclear weapons, in particular for Blue Danube, Britain's first nuclear bomb.

Glass Beach on Ussuri Bay

Known as ‘Glass Beach’, for many years the coastline looked the opposite of a pristine and perfect beauty spot. It was a Soviet era tip, where truckloads of broken vodka bottles and cracked porcelain were dumped. Over many years, the waves smoothed away the sharp edges as it turned the shards of glass and china over in the water. They have now become a tourist attraction on Ussuri Bay, near the naval port of Vladivostok in the east.

The Forgotten Giants

Danish artist Thomas Dambo has been building stuff using trash and recycled materials since an early age, starting with smaller sculptures such as birdhouses and furniture to bigger pieces such as the six “Forgotten Giants” he recently installed around Copenhagen.

The Crypt of Civilization

Under the foundation of Phoebe Hearst Memorial Hall at Oglethorpe University in Georgia, the United States, is a large room, that was sealed shut with a welded stainless steel door more than seventy five years ago.

The Fortress of Mimoyecques

About twenty kilometers from the city of Boulogne-sur-Mer, near the hamlet of Mimoyecques, in northern France, lies a once-secret underground Nazi base.

Monument to The Armenian Alphabet

Located near the village of Artashavan, close to the highway, in Armenia, stands 39 giant carved Armenian letters dedicated to the language its speakers take pride in.

The Bottlecap Alley

For years, boozers from the Texas A&M University in College Station, Texas, and elsewhere, have been paving a short alley located between the pub Dry Bean and the restaurant Dixie Chicken, with used bottle caps.

Equihen Plage

Equihen Plage, on the coast of northern France by the English Channel, is a small seaside village with a population of about 3,000.

Mrauk U

Spread across the beautiful rolling hills of Rakhine in Western Burma, lies a little known archeological site—the medieval town of Mrauk U.