The earliest fortifications on Landenberg hill probably date back to the early 11th century, when the Counts of Lenzburg built a wooden fort there.

It is unclear whether the Hexenturm, built in the late 13th century, was part of the Landenberg complex, a replacement to it or simply a nearby castle.

Traditionally it was believed that the attack happened to Landenberg Castle, though more recent research indicates that it may have been the Hexenturm.

[5] After the castle was abandoned, the walls were slowly broken up for building material and animals were penned inside.

The current armory building was built in 1711 and required demolishing a medieval tower on the south-west corner to open up space.

[7] A shooting range was built on the hill top in the early 18th century, but was destroyed in a fire in 1747.

The upper story of the central features a richly decorated large ball room or meeting hall.

The western corner was the highest part of the hill and was guarded by a 10.5 m (34 ft) square tower.