Once upon a time in Bulgaria, there was a man named Pancho Semov - a billionaire so rich that he was known in the local press as 'The Rockefeller of Bulgaria.' He had this mansion built to his own design, and when he died, he kindly left it to the local community in his will. He wanted it to become a school, or a retirement home.
It was ultimately used for a noble purpose, but not as Semov envisioned. His mansion became an isolation ward for people suffering from tuberculosis. After that, it was left to fall apart.