Tools from the New Stone Age and weapons from the Bronze Age indicate continuous habitation of our region. Traces of the oldest culture known to us by name, the Celts, have been proven through findings such as coins, a belt hook, and a well preserved ringwall in Leonberg, built around 100 BC. Their artistry with coinage and their skills in casting metals can be seen in three display cases containing finds that are over 2,000 years old. The Middle Ages, with the founding of Marktl by the Counts of Leonberg and a history of shipping and navigation on the Inn, are presented in detail using models and certificates from the times.

A home-kitchen equipped with many once-useful objects is connected with the 1st room. Clothing and headgear, as well as a typically middle-class bedroom, a masterpiece of rural carpentry skill from the 19th Century, provide an insight into a former way of life. Uniforms, weapons and decorations, especially those of the Royal Bavarian Army, can be seen in room 5.
The development of timepieces, from the unique wall clock of about 1650 to a hand-forged tower clock of around 1750, can be traced in room 6. Room 7 is dedicated to the popular piety and sacred folk art of our ancestors. The special features of this room are the gifts from Pope Benedict XVI., namely, a gold chalice with a golden tablet and the Zucchetto (apical cap). These three items were used by the Holy Father himself in his private chapel. The pope presented the Heimatbund with these three items as a thankyou for returning the baptismal font from the museum back into St. Oswald's Church. The presence of numerous craft-workshops in Marktl is reflected in rooms 8, 9 and 10. Flax processing, woodworking, and a fully equipped blacksmith are testament to the earlier occupations. The last room is set aside for agriculture, with all the equipments used in the time before mechanization.
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