Constructed in the early 1970s, the City Hall of Dallas is a unique architectural monument, shaped by its architect I.M. Pei as an inverted pyramid placed in the centre of a large open plot of land. While constructed of uncovered concrete, the building is not obnoxiously brutalist, as the colour of the concrete was carefully chosen to match the earth tones of the surrounding grounds. Unusual when constructed, it now provides a unique retrofuturistic vibe, which lent it to star e.g. in Robocop as a dystopian corporate headquarters.