Woodstock took place 50 years ago at Max Yasgur's farm in Bethel, New York, but baby boomers never stopped chasing its legacy. The three days of peace, love, brown acid, mud, and merchandising were considered a '60s countercultural touchstone. But an MTV-driven anniversary concert in 1994 and a particularly violent follow-up in 1999 — followed by what looks to be an ill-fated 50th anniversary festival this summer — made clear what the Hell's Angels and Altamont couldn't: Woodstock simply couldn't be replicated. That's what's made the artifacts from it and its performers so valuable. We combed through some recent auction history and found a handful of Woodstock and Woodstock-related items that have fetched thousands for simply surviving the half-century.