at madison drive, runners pass the north side of the national mall, running by the smithsonian institution's national museum of american history and the national gallery of art. after a loop around the reflecting pool in front of the u.s. capitol, runners continue along the south side of the national mall past the smithsonian castle. runners move along jefferson drive and turn onto the 14th street to marathon's "beat the bridge" checkpoint at mile 20 before returning to virginia.