This home needs no introduction. Built in the 14th century, the castle is now a national monument and museum thanks to the legend surrounding it, which also needs no introduction. It has 57 rooms in total, including 17 bedrooms filled with antiques and historical artefacts. It wouldn’t do for the publicly shy Ira Rennert mentioned above, but for the quirkier billionaire, the 450 million tourists that visit every year may be worth it for living in Dracula’s castle.