Washington National Cathedral
Plan your visit during the morning or afternoon hours when the sun will light up 215 stained glass windows. Construction began in 1907 and was eventually completed in 1990. This majestic building features a 30 foot tall central tower and a crypt where Helen Keller and President Woodrow Wilson are buried. There have been several modern additions including a gargoyle that looks like Darth Vader and an actual moon rock embedded in a stained glass window.