StarCraft II: Wings of Liberty/Protoss buildings

Gateway/Warp Gate
The gateway is a land based structure that allows the Protoss to warp in various ground units.

Photon Cannon
Photon Cannons are the Protoss' only defensive structure. When enemy units get too close, the Photon Cannon will automatically target and attack them.

Stargate
The Stargate is a building that allows the Protoss to warp in various air units.