Designed by I.M. Pei in 1978, the East Building of the National Gallery of Art is easily one of my favorite buildings in the city. The prismatic stone volumes are laid out on a daring plan that follows the angled streets of the baroque city plan while also fulfilling its own internal geometry. The central lobby is a grand multi-level space full of light, crisscrossing with cast-in-place concrete terraces and bridges. Note the curvilinear form of the escalator handrail as it is cut into the stone wall. This was a bold modern move in an era when escalators were considered sub-architectural add-ons. Pei elevates the mechanical by registering the newly iconic graphic signature of the escalator on the monumental walls themselves.
Other I.M. Pei buildings on the straight torquer: