Rossiln.......in the Da Vinci Code.....the two lines actually cross in Rosslyn, Virginia.........but they cross at a point directly West of two bridges...both Memorial bridges....Little Island....a smaller cryptic inside the bigger one.....a hint....nothing says a code need be exact......just that there is a way to get at it...................

Little Island

Washington, DC 20566

Theodore Roosevelt Island (U.S. National Park Service)

https://www.nps.gov/this/index.htm

In the 1930s, landscape architects transformed Mason's Island from neglected, overgrown farmland into Theodore Roosevelt Island, a memorial to America's ...

‎Plan Your Visit · ‎Things To Do · ‎Basic Information · ‎Directions

Theodore Roosevelt's Island Memorial--Presidents: A Discover Our ...

https://www.nps.gov/nr/travel/presidents/t_roosevelt_island.html

Theodore Roosevelt Island National Memorial Washington, DC ... president of the United States in the nation's capital is a small island in the Potomac River.