$6; $4 (ages 6-17, ages 62+, and students and military with ID).
Tues.-Sun. 10-4. Guided 15-minute Mapparium tours depart every 20 minutes Tues.-Sun. 10:20-4. Last tour begins at closing. Research & Reference Services (fourth floor) Tues.-Fri. noon-4. Hours may vary during special events; phone ahead. Closed major holidays. Allow 2 hours minimum.