Located nearly 18 miles from Nagasaki, Japan is the island of Hashima.
Also known as Battleship Island, the entire plot of land is 480 by 150 meters.
The Mitsubishi Corporation purchased the island in 1890 with the purpose of using the island as one of Japan's primary coal mining facilities during World War II, the Korean War, and afterward.
The buildings seen in "Skyfall" were housing projects, like the one below.
Each crammed residents comprising of the company's managers, workers, and families.
Nearly every inch of the island was covered in these projects.
The island's buildings were made of concrete to protect against destruction from bad weather like typhoons.
Accounts of inhabitants recall being forced on the island to work in underground mines.
An excerpt from Korean laborer Suh Jung-woo on being taken to the island:
"I was one of two boys forced onto a truck in my village and taken to the government office, where several thousand other Koreans ranging in age from about fourteen to twenty had been gathered ...
The mine was deep under the sea, the workers reaching it by elevator down a long narrow shaft. The coal was carried out from a spacious underground chamber, but the digging places were so small that we had to crouch down to work. It was excruciating, exhausting labor. Gas collected in the tunnels, and the rock ceilings and walls threatened to collapse at any minute. I was convinced that I would never leave the island alive."
In 1959, the island was one of the most densely populated cities with more than 5,000 inhabitants.
It's estimated that 835 people lived on every two-and-a-half acres of land ... approximately a square meter and a half per person.
According to an inhabitant of the island, this was known as the "Stairway to Hell" ...
It led to most parts of the buildings, neighboring residents, the baths, and recreation areas.
... like this one.
This was known as the "salt rain crossing" ...
... where people waited for the passing waves of typhoons and storms.
As coal became obsolete in 1960s Japan, the mines on the island were shut down. The last people left Hashima in 1974 leaving it to decompose.
The island was closed for decades to the public, but since April 2009, sightseeing boats take tourists for small tours on one end of the island. It takes about 50 minutes to get from Nagasaki to Hashima.
Skyfall's production notes simply refer to Hashima as the Dead City, an "abandoned island off the coast of Macao."
On-island shots were done on a stage in Buckinghamshire's Pinewood Studios.