On the banks of the Potomac River, and overlooking the Nation's capital, the Arlington and area is very much affiliated with Washington, DC. The centers of Arlington and Alexandria only have a population of 117,000 people, but are connected with the District of Columbia - via public transit and several bridges - and allow visitors to experience the highlights of both metro areas. The Arlington National Cemetery is the burial ground of 225,000 military personnel and their dependants, and is also home to the Tomb of the Unknown Soldier, where the Changing of the Guard is one of Arlington's most popular attractions. John F. Kennedy's grave is also here, and the eternal flame sees more visitors than any other site in the graveyard. Alexandria, a charming district featuring streets lined with old brick homes transformed into restaurants, shops, and taverns, offers a number of interesting stops. Alexandria's Torpedo Factory Art Center sits on the waterfront and houses a range of work from local artists. Mount Vernon is one of the country's most visited national historic sites. The former country estate of George Washington features tours of the mansion and grounds.