With one of the largest permanent installations of contemporary art in the world, the Chinati Foundation displays works by American minimalist Donald Judd and others in buildings spread over 340 acres of the former Ft. D. A. Russell. The Judd collection includes 15 concrete works outdoors, plus 100 aluminum pieces housed in two converted artillery sheds. You'll also see 25 sculptures by John Chamberlain and an installation by Dan Flavin that occupies six former army barracks. The museum's comprehensive guided tours require a significant commitment of time—six hours, including a two-hour break for lunch—and energy to walk up to 1½ miles over uneven terrain. While self-guided tours are always an option, space on the guided tours is limited. Reservations are recommended.