1. Gettysburg National Military Park Museum and Visitor Center is located in Gettysburg, Pennsylvania, which was the site of the Battle of Gettysburg during the American Civil War. The museum and visitor center offer interactive exhibits, films, and artifacts related to the battle and the Civil War. It also serves as the gateway to the Gettysburg battlefield, with park rangers available to provide guided tours and information. The museum houses a collection of over 43,000 Civil War artifacts, including weapons, uniforms, and personal items belonging to soldiers who fought in the battle. Interesting facts include that the museum houses the largest collection of Confederate artifacts outside of the South and that the iconic painting \"The Battle of Gettysburg\" by French artist Paul Philippoteaux is displayed in a 360-degree theater.

2. The museum and visitor center are open daily from 9:00 am to 5:00 pm, except for Thanksgiving Day, Christmas Day, and New Year’s Day. The phone number for the visitor center is (877) 874-2478.

3. Admission to the museum and visitor center is $15.50 for adults, $14.50 for seniors (ages 65+), and $10.50 for children (ages 6-12). Children under 6 are free. Tickets can be purchased online or at the visitor center. Gettysburg is about a two and a half hour drive from Washington D.C., and there are also tour buses and shuttles available from the city.