The Trade Fair Palace is one enormous glass-roofed atrium with tier upon tier of galleries running up around it, and the National Gallery's modern art hangs on them. You come in at the bottom and the building goes up in front of you, floor above floor, before you have looked at a single picture. On the walls is Czech and international painting and sculpture from the nineteenth century onward, the collection the country had nowhere large enough to show.
Oldřich Tyl and Josef Fuchs put it up between 1925 and 1928, and it gave them roughly thirteen and a half thousand square metres of floor. Then the fairs moved out, offices moved in, and in 1974 it burned. It stood as an empty shell for seventeen years, and the doors did not open again until December 1995. What the rebuild did not touch is the shape. The tiers you climb are the levels the fair was laid out on, and nothing about them was designed with a painting in mind.