Arlington House, located in Virginia's Arlington National Cemetery, is a must-see point of interest for any national park tour. The house, built by George Washington Parke Custis in the early 1800s, was once the home of Robert E. Lee and his family. Visitors to Arlington House can take a guided tour of the mansion, which has been restored to its original appearance. The house also features exhibits on the Custis and Lee families, as well as the history of the Arlington National Cemetery.

One of the unique things visitors to Arlington House will see is the panoramic view of Washington, D.C. and the surrounding area from the house's porch. The house also has a beautiful garden and several walking trails. Visitors can also learn about the history of the Arlington National Cemetery and pay their respects to the many service members buried there.

One of the main reasons to visit Arlington House is to learn about the history of the Custis and Lee families and their ties to the Civil War. The house also offers insight into the history of the Arlington National Cemetery and its connection to the Civil War and subsequent conflicts. Overall, Arlington House is a fascinating and educational point of interest that is not to be missed on any national park tour.