The Tykocin Royal Castle is a 15th-century castle located on the right bank of the river Narew in Tykocin, Poland. It fell into ruin in the 18th century and its reconstruction began in 2002.
Wikipedia https://en.wikipedia.org/wiki/Tykocin_Castle
Official Website https://www.zamekwtykocinie.pl/
Coordinates 53°12'47.404" N 22°46'13.858" E