The historic main building of what's known locally as Politechnika Warszawska is an absolute wonder of neo-baroque architecture designed by Stefan Szyller at the turn of the 18/19th centuries. This stout, sturdy two-story building with its unique rounded corners survived WWII bombing and was quickly retouched after the war. Its magnificent facade features an array of architectural embellishments they just don't teach the kids inside anymore: sculptures, bas-reliefs, frescoes and sgraffito, to name a few. If you think the exterior is impressive, finagle your way inside to see the pentagonal cloister courtyard with its four stories of arcades, phenomenal staircase and beautiful stained-glass roof - one of the most-photogenic places in Warsaw. Come on the open hours but note that occasionally the place is closed for a private event.