Parola Tank Museum, officially Armoured Vehicle Museum displays various tanks, armoured vehicles and anti-tank guns used by the Finnish Defence Forces throughout its history. A rare exhibit is an armoured train used in World War Two. A few kilometers away from the museum is also the Armoured Brigade. The museum was opened June 18, 1961, when there were 19 tanks and 12 anti-tank guns on display. Also Leopard 2A4, the latest tank in the Finnish Defense Forces is displayed.
Reference: Wikipedia
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.