Pendleton Underground Tours is a nonprofit established in 1989 offering guided tours through Pendleton's underground passageways and historic sites. The approximately 90-minute daily tour (minimum age 6) descends beneath downtown sidewalks to visit the Shamrock Card Room Bar, Hop Sing's Laundry, Empire Ice Cream Parlor, Prohibition Card Room, Duck Pin Bowling Alley, the Cozy Rooms bordello, Chinese opium dens, living quarters, and jails. Tours operate year-round except Tuesdays and Sundays; reservations required by calling 541-276-0730. Once annually on the Saturday after Mother's Day, the nonprofit hosts "Past Comes to Life," a fundraiser featuring over 75 live actors and samples throughout the underground (age 21+, reservations open January 2nd). The tours explore Pendleton's history as the entertainment capital of Eastern Oregon, drawing on documented records, oral histories, and local traditions.