It means protection and transcendence. A big castle symbolizes the search for a more spiritual life. If the castle is white, then it shows the desire of a quiet life in meditation and spirituality. If it’s dark, it symbolizes a struggle to emerge from a spiritual confusion. If it’s black, it reflects fear of fate, not reaching salvation. If we talk in a less transcendent sense and everyday life, then it shows that when we see a castle, wealth will be obtained depending on your status. If it is dilapidated but still beautiful, we will have problems while achieving wealth but in the end, we will get it. If we live in the castle, then wealth is assured.
Read more about dreaming of Castle in other dream meanings interpretations.