The Bastion of Vilnius Defensive Wall is a restored part of the city's early modern fortifications, built to strengthen the old wall against artillery. Today it functions as a museum site, with underground spaces, defensive architecture, and exhibits on the city's military history.
Its hillside position gives good views back toward the old town roofs and church towers, which makes the visit more than a narrow weapons display. It is a strong stop for travelers tracing Vilnius beyond the main cathedral-to-Gediminas route.