American landmark to remember? (5)

I believe the answer is:

alamo

(Other definitions for alamo that I've seen before include "Site of a Texas siege, 1836" , "The red planet" , "Fort in San Antonio, once famously besieged" , "Texas fort, scene of famous siege by Mexican army" , "The --, Texan mission besieged in 1836" .)

I've seen this clue in the Universal.

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