Trethevy Quoit is a well-preserved megalithic structure between St Cleer and Darite in Cornwall. It is known locally as 'the giant's house'. Like other portal structures of this type, Trethevy Quoit was originally covered by a mound. The remnants of this suggest a diameter of 6.5 metres. The remaining seven stones and the 3.7-metre long and 10.5-ton cover slab were inside the mound. At the upper end of the cover slab is a natural hole, which may have been used for astronomical observation. The group of horizontal stones is composed of a fallen back wall, two overlapping side wall stones, a front stone and a somewhat remote flanking stone. The special feature of Cornish portal graves is that by such stones sometimes a smaller partially closed area is created before the front end. Some stones have hole-like perforations as decoration. The front stone is often called an entrance stone, although in most portal structures this can not be moved. Trevethy Quoit is a rare exception here, because a small rectangular stone moving at the bottom right of the front allows access to the chamber, which is now opened only very rarely.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.