Open 24 hours. Located in Greenbelt, MD the Space Center is open daily 10 a.m. to 4 p.m. Closed Thanksgiving, Christmas, New Year's Day. The Newseum located at 1101 Wilson Blvd. The Newseum is the place to have hands-on fun and go behind the scenes to find out how news is made. Open Wednesday through Sunday from 10am-5pm.
Admission is free.
Call for exact operating days and hours. The world's largest office building, the Pentagon located at I-395 S. to Boundary Channel Drive exit in Arlington, VA, is 3.7 million square feet. Monday - Friday. Closed weekends and all Federal holidays. It was designed for Loren Pope, a Washington newspaperman and is located at 9000 Richmond Hwy.