Struve Geodetic Arc

Known as one of the most beautiful historical sites in Ukraine, the Struve Geodetic Arc is a chain of survey triangulations that stretches 2,820 kilometers (1,750 miles) from Hammerfest, Norway, to the Black Sea, passing through ten nations and yielding the first exact measurement of a meridian arc. The 'Struve Arc,' a cross-border scientific and cultural heritage object, is made up of 258 triangles that create a chain of 256 primary points. The chain is 2820 meters long in all.

It was able to determine the correct size and shape of the planet Earth, proving Newton's claim that our world is a three-dimensional oval, thanks to the Arc. In geodesy, the arc is significant, as it is a testament to international scientific cooperation.