The Lower Castle has originally been built in the 13th century, but it has been damaged in the 17th century and completely demolished when the Kingdom of Poland and Lithuania was split into three sections by Prussia, Austria and Russia. It has been rebuilt in 2000. Today, it's a museum.
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Here are my get pushed-challenges
Update 05/2019: Year 3 begins! I'm living in Bremerhaven near the North Sea since October...