Los Alamos County welcomes the National Park Service to their Manhattan Project National Historical Park Visitor Center at 475 20th St. Winter hours of operation are 9 a.m. to 4 p.m. Wednesday through Sunday with a 1:30 p.m. Afternoon Program (subject to change). From left, NPS Los Alamos Unit Site Representative Charles Strickfaden, Los Alamos County MPNHP Project Manager Linda Matteson and Park Ranger Kirk Singer. Photo by Leslie Bucklin/LAC