CastelBrando, former Castrum Costae, is a medieval castle situated on a dolomite limestone rock at an elevation of 370 m (1,210 ft) above sea level, overlooking the villages of Cison di Valmarino and Valmareno, Northern Italy.

CastelBrando was originally built in the Roman age as a defensive fortress[1] in order to protect the important lines of communication which connected Northern Italy to the countries on the other side of the Alps.

[2][4] In the first half of the 16th century Antonio Maria Brandolini (1476–1522), commissioned skilled engineers to enlarge the central part of the castle in Sansovino style,[2] adding Venetian Gothic double and triple mullioned windows.

[2] In 1700 the Brandolini family commissioned Ottavio Scotti, architect and Count of Treviso, to design and build an extension to the southern part of the castle.

[2] In 1997 CastelBrando was purchased by Quaternary Investments SpA, who started an expansive renovation program in order to convert it into a hotel and museum.