Blankenheim Castle was built around 1115 by Gerhard I and became the family seat of the House of Blankenheim. The lords of Blankenheim were elevated to the countship in 1380.
The site has been remodelled on numerous occasions. In the course of time the medieval defensive site was converted into a Baroque schloss with a Baroque garden and an orangery. Its end came in September 1794, when French troops marched into Blankenheim. Countess Augusta of Manderscheid-Blankenheim and her family fled to Bohemia.
For a long time the castle remained uninhabited until, in 1894, Prussia started work on safety measures. In 1926 it was taken over by the German Gymnastics Club and, in 1936, the site was acquired by the German Youth Hostel Association. They converted the castle into a youth hostel.
In 1996 the wildlife park tunnel was rediscovered. It is a noteworthy water supply gallery. Although the River Ahr flows nearby, the castle depended on rainwater. As a result, Count Dietrich III of Manderscheid-Blankenheim had a water supply tunnel excavated in 1469. The water from the spring In der Rhenn was thereby diverted from about a kilometre away and led to the castle.References:
Easter Aquhorthies stone circle, located near Inverurie, is one of the best-preserved examples of a recumbent stone circle, and one of the few that still have their full complement of stones. It consists of a ring of nine stones, eight of which are grey granite and one red jasper. Two more grey granite stones flank a recumbent of red granite flecked with crystals and lines of quartz. The circle is particularly notable for its builders' use of polychromy in the stones, with the reddish ones situated on the SSW side and the grey ones opposite.
The placename Aquhorthies derives from a Scottish Gaelic word meaning 'field of prayer', and may indicate a 'long continuity of sanctity' between the Stone or Bronze Age circle builders and their much later Gaelic successors millennia later. The circle's surroundings were landscaped in the late 19th century, and it sits within a small fenced and walled enclosure. A stone dyke, known as a roundel, was built around the circle some time between 1847 and 1866–7.