Boskednan stone circle is a partially restored prehistoric stone circle near Boskednan, 6.4 kilometres northwest of the town of Penzance in Cornwall. The megalithic monument is traditionally known as the Nine Maidens or Nine Stones of Boskednan, although the original structure may have contained as many as 22 upright stones around its 69-metre perimeter.
The stone circle once probably consisted of 22 granite blocks, from which 10 still survive. Six stones stand upright, one sits half a metre out of the ground, the others remain lying in the soil. The stones are all about 1 m high, the highest measure approximately 2 m and stand to northern edge of the circle. The stone circle originally described a circle with a diameter of approximately 22 m. The stone circle may have belonged with the nearby barrow to an extensive cult district.
Stone circles such as that at Boskednan, were erected in the late Neolithic or in the early Bronze Age by representatives of a Megalithic culture.
Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.