The ruins of Castelmur Castle is a large ruined castle located above the village of Bondo

Bondo, Switzerland

Bondo is a former municipality in the district of Maloja in the Swiss canton of Graubünden. It's now part of the municipality of Bregaglia.-Geography:...

 in the municipality of Bregaglia

Bregaglia

Bregaglia is a municipality in the district of Maloggia in the canton of Graubünden in Switzerland. It is a merger of the municipalities of Bondo, Castasegna, Soglio, Stampa and Vicosoprano, all located in the Val Bregaglia.-External links:...

 in Graubünden

Graubünden

Graubünden or Grisons is the largest and easternmost canton of Switzerland. The canton shares borders with the cantons of Ticino, Uri, Glarus and St. Gallen and international borders with Italy, Austria and Liechtenstein...

, Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

.

The castle complex includes ruins from both the High Middle Ages

High Middle Ages

The High Middle Ages was the period of European history around the 11th, 12th, and 13th centuries . The High Middle Ages were preceded by the Early Middle Ages and followed by the Late Middle Ages, which by convention end around 1500....

 and the Late Middle Ages

Late Middle Ages

The Late Middle Ages was the period of European history generally comprising the 14th to the 16th century . The Late Middle Ages followed the High Middle Ages and preceded the onset of the early modern era ....

 as well as traces of much earlier constructions. Located on the site of the Roman

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 way station Murus, the complex includes fortifications across the valley as well as the church of S. Maria which is first mentioned in 988. The fortifications at Castelmur may be, after the Three Castles of Bellinzona

Three Castles of Bellinzona

The Three Castles of Bellinzona are a group of fortification located around the town of Bellinzona in canton Ticino, Switzerland. The group is composed of Castelgrande, castle Montebello, castle Sasso Corbaro and fortified walls...

, the most important example of medieval valley fortifications in modern Switzerland.