Tour one of two gravitational wave observatory sites in the U.S. Your LIGO host will offer a presentation about LIGO's research, followed by a walking tour of the facility. Seasonal clothing and comfortable shoes are recommended. Tours are best suited for middle school and above; all ages are welcome. Admission is free. LIGO's facilities are wheelchair accessible. Find more information on the Web at www.ligo-wa.caltech.edu, at outreach@ligo-wa.caltech.edu or at 509-372-8181.