Castle
The castle is a symbol of enclosure, of the walled and defended city; often, the castle holds "some treasure or imprisoned person and is inhabited by a monster or wicked person who must be overcome to obtain the treasure or release the imprisoned, which depicts the treasure of esoteric knowledge or spiritual attainment".
According to Julien, the heroines of fairy tales sleep in castles as they wait for Prince Charming to awaken them, which is a symbol of the awakening of the conscious mind. It may also reflect ostentation and luxury. Information taken from: Online Symbolism Dictionary
Songs referenced:
'97
Bonnie & Clyde
Father Lucifer
(underlyrics)