A fascinating look at some proposed space colonies, including the Stanford Torus designed by NASA. You should definitely do this, earthlings, before you nuke North Korea. (Read more interesting facts about the torus below the infographic).
The (Stanford) torus is a doughnut-shaped ring that is 1.8 km in diameter (for the proposed 10,000 person habitat described in the 1975 Summer Study) and rotates once per minute to provide, via centrifugal force, between 0.9g and 1.0g of artificial gravity on the inside of the outer ring.
The torus would require nearly 10 million tons of mass. It would be constructed from materials extracted from the Moon and sent to space using a mass driver. A mass catcher at L2 (Lagrangian point 2) would collect the materials, transporting them to L5 where they could be processed in an industrial facility to construct the torus. Only materials that could not be obtained from the Moon would have to be imported from Earth. Asteroid mining would be an alternative source of materials.
Location: Earth–Moon L5 Lagrangian point
Total mass: 10 million tons (including radiation shield (95%), habitat, and atmosphere)
Diameter: 1,790 m (1.11 mi)
Habitation tube diameter: 130 m (430 ft)
Spokes: 6 spokes of 15 m (49 ft) diameter
Rotation: 1 revolution per minute
Radiation shield: 1.7 meters (5.6 feet) thick raw lunar soil