Põltsamaa Castle
castle in Estonia...
Author: –, License: Description is available under license CC-BY-SA IGO 3.0
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: NFUAJ
Source: unesco.nl
https://whc.unesco.org/en/list/1187
https://whc.unesco.org/en/list/1187
License: Description is available under license CC-BY-SA IGO 3.0
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: UNESCO/CPE
Description is available under license CC-BY-SA IGO 3.0
source: NFUAJ
Source: unesco.nl -
Source and License:
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 a meridian. This helped to establish the exact size and shape of the planet and marked an important step in the development of earth sciences and topographic mapping. It is an extraordinary example of scientific collaboration among scientists from different countries, and of collaboration between monarchs for a scientific cause. The original arc consisted of 258 main triangles with 265 main station points. The listed site includes 34 of the original station points, with different markings, i.e. a drilled hole in rock, iron cross, cairns, or built obelisks.
Further reading
Slug: whc-struve-geodetic-arc
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Created At: Tue Jan 21 2025 20:51:26 GMT+0100 (Central European Standard Time)
Updated At: Fri Feb 20 2026 16:25:32 GMT+0100 (Central European Standard Time)
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Version: 1
Status: test_v1
