Call Of Duty Black Ops 3 Multiplayer Map Stronghold Gameplay.

"A high-tech Swiss chateau in the frozen, mountainous Alps, Stronghold has an asymmetrical design with a mix of exposed sightlines and tight, close quarters."

Stronghold is a multiplayer map in Call of Duty: Black Ops III.

A portion of the map can also be found in Black Ops 4 in the Estates location in Blackout.

Trivia
In the building marked "21", there are five cases, with four displaying different-colored grunts and the other displaying the War Machine, Tempest, Purifier, a 48 Dredge without an ammo drum, H.I.V.E., and an XM-53.
There are two more different-colored grunts that can be found in the Coalescence building in display cases.
A photograph of Black Ops 2 can be found in the building.