When going in the direction of Medininkai one finds the Struvė Geodetic Arc, a chain of survey triangulations, stretching across ten countries from Hammerfest in Norway to the mouth of the Danube River near the Black Sea. These survey points represent a remarkable 19th-century scientific endeavour to determine the size and shape of the Earth. The astronomer and geodesist, and Tartu University professor Friedrich Georg Wilhelm Struve created methodology for measuring a long segment of a meridian. Three out of thirty-four station points are in Lithuania, in Meškonys (in the Nemenčinė administrative district), in Paliepukai (in the Nemėžis administrative district) and in Gireišiai (in the Rokiškis district). In 2005 Struvė Geodetic Arc was put on the UNESCO World Heritage List.