Monolith

Monolith is a Halo 4 multiplayer map. It was released as part of the Majestic Map Pack on February 25, 2013.

Description
Monolith is set in a Forerunner monument surrounded by an orbiting asteroid belt, which was built to honor fallen Warrior-Servants of the Human-Forerunner War. It is a symmetrical four base map, arranged to neighbor each other in a rough circle. There are many walls and barriers on the ground levels, allowing plenty of cover and close-combat fights. The bases allow for greater height, letting snipers pick off players on the ground floor.

Trivia
Despite having no visible barrier of protection from the vacuum of space, there is full sound on Monolith. It's possible that the Forerunners were capable of maintaining an atmosphere around small bodies in space without the use of solid coverings or energy shielding.