Remains found in a highly uncommon 5,000-year-old grave in Scotland have been identified as skeletons.

According to a statement released on Tuesday by National Museums Scotland, archaeologists have discovered the remains of a tomb dating back 5,000 years on an Orkney Island in Scotland.

The museum reported that a tomb from the Neolithic period, which is considered “extremely uncommon,” was mostly destroyed in the 19th century without documentation. Out of the 12 tombs discovered in Orkney, they are recognized as “the highest achievement of Neolithic architecture in northern Britain.”

After being dug up for three weeks, the burial place consists of a big chamber made of stone at the heart of a cairn. A cairn is a pile of stones created by humans to serve as a landmark for a burial site. The large stone chamber is enclosed by six smaller rooms.

Aliza Chasan