Sorgenfri Palace was built by the architect Francois Dieussart in 1705-06 for Carl Count Ahlefeldt. From 1730, this country house was owned by the royal family, and Crown Prince Frederik (V) had court architect Lauritz de Thurah build a wing for the gentlemen of the Court and a horse stable. When Frederik V became king, the palace was given to his aunt, grand duchess Sophie Caroline of East Friesland, who let de Thurah demolish the main building in 1756-57 and build a new palace. From 1791-94, the heir apparent, Frederik (VI), expanded and modernised the palace.
Frederik VII later transferred the palace to the state. In 1898, the state placed the palace at the disposal of Crown Prince Christian (X) after modern conveniences and a glassed veranda were installed. Sorgenfri Palace was Christian X and Queen Alexandrine’s preferred summer residence, and both Frederik IX and the heir presumptive, Prince Knud, were born there. Prince Knud and his wife, Princess Caroline-Mathilde, lived in the Palace until their deaths in 1976 and 1995, respectively. Sorgenfri Palace is not open to the public, but part of the park is accessible to the public.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.