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 Obradoiro façade of the grand Cathedral of Santiago de Compostela, Galicia, Spain; built between The cathedral is the reputed burial-place of Saint James the Great, one of the apostles of Jesus Christ.
The Cathedral of Notre-Dame of Reims was the site of the coronation of French Kings. Erected between 1211 and 1516, in accordance with an architectural program of immense artistic richness, the Cathedral of Reims survives as one of the most beautiful examples of Gothic art.