The exact building date of Castel Gavone ('Castrum Govonis'), the former seat of the Del Carretto Marquisses, is still unknown. The castle rises on a huge, steep curvilinear rampart on top of the Becchignolo hill.
The castle was allegedly built by Enrico II in 1181 on remains of previous defensive structures. It was certainly fortified in 1292. Destroyed during the struggles with Genoa, it was rebuilt by Giovanni I in 1451-1452, along with the Borgo walls.
It underwent further modifications until 1715 when it was largely dismantled by the Genoese who wanted to destroy the symbol of their ancient enemy after their conquest of the Marquisate. Only some of the retaining side-walls were spared in addition to the very famous Diamond Tower (today the best-preserved structure). The Tower, which has a curved triangular base, was built using diamond-faceted squared stones. It faces south with its acute edge resembling the bow of a ship. It is an excellent example of late medieval military architecture. Many of the original materials such as beams, stones and columns, were later used to build churches, gates and houses.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.