Anyone visiting Fort Worth, TX must see the Museum of Modern Art completed in December, 2002. The standing sculpture by Richard Serra, "Vortex" itself is worth the trip.
Made of 2" steel slabs 10' wide and 67' tall, twisted, curved, and assembled with a 10' opening on top, the total weight is 230 tons. It's a sculpture that can be interacted with, and when you walk inside it becomes apparant that acoustically it is a giant bell, and you are the clapper. Any sound, no matter how slight is immediately reverberated. Speech becomes almost impossible to understand because of the immediate echo. I repeatedly kicked the wall inside and produced a loud, sustained, and very deep rumble. A young man was sitting on the floor inside beating on the concrete and his shoes with interesting effects. It's one of the most impressive sculptures I've ever seen.
The inside of the museum is wonderful with permanent exhibits of twentieth century artists including Jackson Pollock, Picasso, Clifford Still, Gottlieb, Andy Warhol, and many others.