The central feature of the biggest paper model of the biggest castle complex in the world is Prague Castle. It measures 30 x 100 x 160 cm and contains 3250 parts. It is scaled in 1:450. You can see it at:
http://www.betexa.cz/eng/btx-ramy.html
I do not see pictures of the castle or the cathedral in the gallery. Here is St. Vitus Cathedral scaled by itself in 1:350.
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