Beijing’s Underground City
One of the entrance to the Underground City in Beijing. Photo credit: Scott Sherrill-Mix/Flickr In the late 1950s, relation between the tw...
One of the entrance to the Underground City in Beijing. Photo credit: Scott Sherrill-Mix/Flickr In the late 1950s, relation between the tw...
When Istanbul was Constantinople during the period of the great Roman, and later Byzantium Empire, hundreds of subterranean cisterns were bu...
Buried beneath Frederiksberg Hill in the heart of Søndermarken Park, in Copenhagen, is a massive underground space that once held up to 16 m...
In the late 19th century, when the Great Northern Railway laid down its line between Seattle and Minneapolis, a distance of more than 1,600 ...
Coober Pedy is a small town in northern South Australia, 850 kilometers north of Adelaide on the Stuart Highway. On the surface, the place l...
The Survival Condo Project is a luxury condo complex housed in a former underground missile silo near Concordia, in Kansas, in the US. Locat...
Coober Pedy is a town located in northern South Australia and is known as the opal capital of the world, as nearly 95 percent of the world...