Historic Centre of Riga

Riga was a major centre of the Hanseatic League, deriving its prosperity in the 13thโ€“15th centuries from the trade with central and eastern Europe. The urban fabric of its medieval centre reflects this prosperity, though most of the earliest buildings were destroyed by fire or war. Riga became an important economic centre in the 19th … More Historic Centre of Riga

Struve Geodetic Arc

The Struve Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through 10 countries and over 2,820 km. These are points of a survey, carried out between 1816 and 1855 by the astronomer Friedrich Georg Wilhelm Struve, which represented the first accurate measuring of a long segment of … More Struve Geodetic Arc