With six lines and 91 stations, the D.C. transit system is the second busiest in the U.S. Many D.C. metro stations utilize “Brutalist” architecture, which became popular in the 60’s and 70’s. The style originates from French term Béton brut, which translates to “raw concrete.”
comrade feedback
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K. Wahlgren 
The subway stations are very interesting. Photos of just the roof of the station make interesting abstract images
I agree. Much of it reminds me of some type of Eastern bloc architecture.