If you’re a fan of vam­pire lore, you’re prob­a­bly famil­iar with Vlad the Impaler, who famous­ly inspired the title char­ac­ter in Bram Stok­er’s “Drac­u­la.” The blood­thirsty ruler was kept pris­on­er in Corvin Cas­tle in real life, where many strange sight­ings have been report­ed.