Kasematten Wiener Neustadt, Museum in a former weapons casemate in Wiener Neustadt, Austria.

Kasematten Wiener Neustadt is an underground fortress with vaulted chambers and fortified stone walls arranged across multiple levels beneath the city center. The structure showcases medieval construction techniques and remains largely intact as a subterranean network.

The city wall of Wiener Neustadt was begun in the late 12th century, but the casemates themselves were built from 1551 to 1557 by master builder Hans Tscherte as vaulted cellars for storing weapons. They were later deepened for larger arms, converted for civilian use from 1936 to 1938, and partly destroyed in World War II. After decades closed to the public, they were restored for the 2019 Lower Austrian State Exhibition.

The fortress shaped how the city developed its defenses and continues to show visitors the practical methods of medieval military construction. The stone vaults and masonry on display reveal the craftsmanship required to build such structures.

The museum is accessible in the city center and offers guided tours to explore the underground chambers. School groups can participate in workshops focused on historical defense systems and fortress construction.

The vaulted cellars were dug deeper over the centuries to store ever larger artillery pieces, and the round brick shafts set into the crown of each vault are the original ventilation channels. During restoration for the 2019 exhibition, part of a Zwingermauer (outer defensive wall) was uncovered. Inside hangs a permanent oil painting by Ludwig Drahosch showing actress Nina C. Gabriel in Büchner's Dantons Tod at the Wortwiege festival in 2021.