Hajnáčka castle was built in the Gothic style against the Mongol invasion in the mid-1200s. Later, in the mid-15th century, the construction was finished. Hajnáčka was the seat of important feudal lords. In 1545 the castle was besieged and conquered by Ottomans. At the end of the 16th century and the first third of the 17th century castle was an important part of the anti-Turkish defensive line. Nevertheless, it Turks in 1645 again briefly occupied for few years. In the 17th century the castle was only partially inhabitated. In 1703 it was burnt down and no longer restored.
Today the remains of walls stand on the top of the hill which is hard to reach.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.