This is part of the Vilnius Defensive Wall, often called “barbican”. The Bastion is a Renaissance-style fortification characterized by its original construction. It consists of a tower installed in the city defense wall, underground gun ports and a connecting corridor, which turns into a 48-metre long tunnel.
The Bastion was built in the first half of the 17th century by the German military engineer, Friedrich Getkant. The Bastion was severely damaged during the wars with Moscow in the middle of the 17th century.
During World Wars I and II, German military arsenals were located in the building. People can enjoy a picturesque view of the Old Town from the Bastion terrace.