Liw Castle, Liw, Poland
Liw Castle is a ruin of a castle built in the 15th century as a border watchtower in Liw, for Mazovian prince Janusz I the Elder.
Today, the castle is one of the largest museums of arms in Poland. It is home to a collection of cold weapon and firearms.
Open Tuesday to Sunday, from 10am to 4pm (on Sundays the castle & museum open at 11am)