Crystal Bridges — Museum

Moshe Safdie sank the building down into an Ozark ravine instead of setting it above one: two cable-and-wood pavilions span the gorge as bridges and dams at once, holding back a pair of spring-fed ponds under copper roofs that read as risen earth. General admission stays free, endowed rather than ticketed, so the building and its American-art collection are a door you walk through, not one you buy. The water and the glass earn the first trip; the collection of American art, deep enough to reward a second and a third, is what brings you back. Tuesdays it's closed, and off-summer hours move around, so check before you drive out.