One of the Washington area's newest memorials honors those killed on 9/11/2001 at the Pentagon. Visiting the Pentagon Memorial is a good opportunity to consider how history and design, sound and light, all contribute to the making of sacred space. In its attention to geometry, it feels very much like a labyrinth as it carries through a theme of order emerging from violence and chaos.
This video will give you a taste of what it's like. You can visit 24 hours a day, 7 days a week. It's an easy walk from the Pentagon Metro station, or you can park at the Pentagon City or Pentagon Row shopping area or, in the evenings, at the Hayes Street lot. As the video shows, sunset is a particularly impressive moment, but I've also enjoyed visiting at night, when the pools under the benches are lighted.