Prince's Palace of Monaco

You're standing at the Prince's Palace of Monaco, in Monaco-Ville, 60 metres above sea level. It's the official residence of the Sovereign Prince of Monaco. Start with the front. It looks like a row of Renaissance palaces from different periods, tied together by one shared ground floor. Behind them rise towers, many with battlements. Those towers were mostly rebuilt in the 19th century. The palace isn't symmetrical, and that gives away how old it is. See the sentries at the entrance? They're always on guard, because this is still a working palace.