I had a dream last night. I purchased a giant old mansion for a ridiculously good price. I love good deals. But it turned out the original owner had figured out the relationship between time and light. He had been able to use his will to send himself hundreds of years into the future by slowing his perceived time. His original servants turned into dark minions over the centuries.
I periodically have similar dreams of giant mansions or castles I buy that have crumbling or haunted wings.