Like Los Angeles's Griffith Observatory (3,4)

I believe the answer is:

art deco

(Other definitions for art deco that I've seen before include "Architecture and design movement of the 1930s" , "Style of design popular in the 1920s and 1930s" , "Redcoat (anag) -- inter-war design style" , "Aesthetic style" , "Style popular in the 1920s and '30s" .)

I've seen this clue in The New York Times.

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