Stock Photo - The archaeologist Stefanie Brueggemann works at an uncovered medieval vault tunnel in Greifswald, Germany, 13 October 2014. The 50-meter-long underground tunnel was uncovered during road construction work in Greifswald and was part of the city gate system in the Western historical city center. The so-called 'Fettentor' and the tunnel were constructed around 1300. This construction mode is typical of Cistercians in France and provides more stability than the vaults in other Hanseatic cities. Photo: Stefan Sauer/dpa | usage worldwide. - Greifswald/Mecklenburg-Vorpommern/Germany

Stock Photo: The archaeologist Stefanie Brueggemann works at an uncovered medieval vault tunnel in Greifswald, Germany, 13 October 2014.

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