The Quoyness chambered cairn is located on Sanday in Orkney. It is approximately 5,000 years old and is located on the shoreside.
The cairn is about 4 metres high and can be accessed by crawling through the entrance passage, itself 9 metres long. Only half the entrance passage is roofed. A stone platform surrounds the cairn, and when originally built the cairn would have looked like Maeshowe today. Bones from 10 adults and 5 children were removed. The property is now in the care of Historic Scotland.
References:House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.