The valley of Val Müstair is internationally renowned for its Benedictine convent of St. Johann in Müstair, a UNESCO World Heritage Site. The oldest parts of the convent and church – with its precious early medieval cycle of wall paintings, the largest and best preserved in the world – date from 775 AD onwards. These buildings are among only a handful of structures to have survived from the Carolingian period; it can be assumed that Charlemagne himself actively supported their construction. The convent’s museum is located in the Planta tower, built around 960, and said to be the oldest secular building in the Alps. It presents 1,200 years of monastic and architectural history, and offers a glimpse into the inner workings of the convent.