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FortressMainz
Fortress Mainz-Bastion Alexander
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The Alexander Bastion belongs to the inner bastioned trace, which was laid out from 1655 under Johann Philipp von Schönborn. It was built in the second construction phase (1668-73) and was named after Pope Alexander VII (1655-66).
Source: festung-mainz.de
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Location: 49.9969, 8.2615