Nice places to visit in Pittsburg

I love that city! However, last time I was there was during my punk rock touring days, so what I consider nice may differ a lot from what you consider nice. I still recommend
The Andy Warhol Museum
http://pittsburgh.about.com/od/things_to_do/p/warhol.htm

And the Carnegie Museums of Art and Natural History
http://pittsburgh.about.com/od/things_to_do/p/carnegie_museum.htm

If you're into live music I recommend the 31st Street Pub.
http://www.31stpub.com/

Cheers!