Strättligburg, Medieval castle ruin in Gwatt, Thun, Switzerland.

Strättligburg stands as a remarkable medieval fortress ruin perched above Gwatt near Thun, featuring the prominent Strättligturm powder tower built in 1699 and stone foundations from the original 13th-century castle that once commanded sweeping views over Lake Thun and the surrounding Alpine landscape.

The castle was the ancestral seat of the Freiherren von Strättligen, a noble family who also owned Wimmis Castle. It dates from the 13th century. In 1332 the Bernese razed the castle. In 1699 the State of Bern built the surviving Pulverturm (powder tower) on the ruin.

Recognized as a Swiss cultural property of cantonal significance, the ruins represent an important example of medieval fortification architecture and serve as a tangible connection to Switzerland's feudal past, contributing to local heritage conservation efforts and educational programs about regional history.

The ruin lies on a hill above the Gwatt district of Thun, in the canton of Bern. The sources give no details on paths, steps, parking or opening arrangements, so check locally before setting out. The site is listed as a Swiss cultural property of cantonal or local significance.

The tower visible today is not medieval: the Bernese state built the Pulverturm in 1699 on the ruined castle of the Freiherren von Strättligen, which had been levelled in 1332. It is the only structure still standing on the hill above Gwatt.