Prefix for dome in San Antonio (5)

I believe the answer is:

alamo

(Other definitions for alamo that I've seen before include "1836 massacre at a San Antonio, Texas mission" , "Where Davy Crockett died, 1836" , "Texas fort, scene of famous siege by Mexican army" , "The red planet" , "The answer is a place of siege" .)

I've seen this clue in the Newsday.

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