Valhalla

Valhalla is a multiplayer level in Halo 3. A from-the-ground-up level, said to be 'the new Blood Gulch', it is a forested valley with mountains in the distance and a creek running through the middle.

Valhalla has "Man Cannons," like Gravity Lifts on Halo 2, instead of launching you up, they launch you around the map, it has been said that they make a loud noise like the grav lifts.

Trivia
According to the scandinavian mythology, Valhalla is the world where gods live, and where the life after death is hold.