It is in fact Warhol who drew me to Pittsburgh. I was lured here by a Web site launched in May by the Andy Warhol Museum. The site (www.warhol.org/tc21) is itself a form of cultural time travel; it makes the contents of one of Warhol's Time Capsules accessible to Internet users. Largely unknown until the artist's death in 1987, the Time Capsules were the 612 cardboard boxes that he filled with the stuff that he accumulated--the by-products of art, life, and fame. Warhol used to keep a box by his desk and toss things in: correspondence, receipts, newspaper clippings, photographs, and gifts. Some of the things were so minor that anyone else would have simply thrown them away. One capsule, archivist Matthew Wrbican tells me, contained hunks of insect-infested pizza dough. Why? No one knows. Some things were so significant--letters from Mick Jagger, a paint palette used by Salvador Dalí--that anyone else would have put them carefully away, but Warhol dropped his overflow in cardboard boxes that were each taped shut, dated, and placed in storage by an assistant.