The Prince's Palace of Monaco has been the official residence of the Grimaldi family in the Principality of Monaco for over 700 years and one of the principal tourist attractions. Some of the palace's rooms are open to the public. The Palace is located on the Rock, it was built on the site of an ancient fortress by the Genoese in the early 13th century. This is where famous Hollywood actress Grace Kelly lived after her marriage to Prince Rainier III. The palace can be visited during several months of the year and is a must-see in Monaco!