The Los Alamos History Museum, managed by the Los Alamos Historical Society, is in the oldest continually occupied structure in downtown Los Alamos. The building was initially built as an infirmary in 1918 and later served as a guest cottage for the Los Alamos Ranch School. During the Manhattan Project, it hosted General Leslie R. Groves. Now an award-winning museum, it offers a comprehensive exploration of the region's history, featuring exhibits on geology, anthropology, the Ranch School, and the Manhattan Project. Visitors can enjoy guided tours offering insights from ancient Puebloan ruins to the homestead-era Romero cabin (both located across from the museum) through 20th-century physics giants. Tickets are available for guided tours, with reservations recommended due to popularity. The museum itself is self-guided, and special programs are available for kids. Additionally, during the summer and fall, daily guided tours are available Monday–Friday at 10:00 a.m. and 1:30 p.m., with a Saturday tour at 11:00 a.m. The Winter Tour Schedule starting Nov. 6, 2023, includes one tour per day at 11:00 a.m., Monday-Saturday.