Introduction to the Marble Cathedral: At the west end of the east-west axis of Amalienborg Palace Square is the "Marble Cathedral". The original intention of building this cathedral was to commemorate the 300th anniversary of the Oldenburg royal family's rule in Denmark (1479-1749). However, After the foundation stone of this project was laid in 1749, due to insufficient funds, it was not completed until more than a hundred years later, in 1894.