Missile complex
A missile complex or missile silo was a structure in which missiles were housed ready for launch if needed. Such missiles included nuclear missiles or antimatter weapons.

Earth Missile Complexes 

On Earth, missile complexes were part of the military infrastructure associated with World War III. After the war, Dr. Zefram Cochrane re-utilized one such site in Montana as a launch facility for his his Phoenix ship, itself a modified nuclear missile. ()

Otrin  Missile Complexes 
On Otrin's homeworld, missile silos housing defensive antimatter weapons were built after the Friendship 1 probe introduced antimatter technology to the locals. ()

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Architecture
Military technology