St. Peter's Square (Piazza San Pietro) is a large plaza located directly in front of St. Peter's Basilica in the Vatican City, the papal enclave inside Rome, directly west of the neighbourhood or rione of Borgo.
At the centre of the square is an ancient Egyptian obelisk, erected at the current site in 1586. It was made of red granite and is 25.5 metres tall. The obelisk was originally erected at Heliopolis, Egypt, by an unknown pharaoh.
Gian Lorenzo Bernini designed the square almost 100 years later, including the massive Tuscan colonnades, four columns deep. A granite fountain constructed by Bernini in 1675 matches another fountain designed by Carlo Maderno in 1613.
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.