Struve Geodetic Arc

Struve Geodetic Arc - Credit: Wikimedia Commons

The Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through ten countries and over , which yielded the first accurate measurement of a meridian arc. Read more on Wikipedia

type: building
date from: Geodetic Arc
UNESCO World Heritage Site: 1187

Source: en.wikipedia.org