Church of Our Saviour on the Spilled Blood, St Petersburg, Russia. As a ghost, I am looking for a castle to haunt. What about this one? I know it isn't technically a 'castle' but look at its magnificent size! I think it would still be splendid to haunt.
The Sainte-Chapelle de Vincennes is a Gothic chapel within the fortifications of the Château de Vincennes near Paris, France. It was founded in 1379 by Charles V of France to house relics of the passion of Christ.
Church of the Holy Sepulchre - The Rotunda is located in the centre of the Anastasis, beneath the larger of the church's two domes. In the center of the Rotunda is the chapel called the Aedicule, which contains the Holy Sepulchre itself.