How much would you pay to live in a lavish palace appointed with the most luxurious furniture and fixings? There are homes that would stretch any budget, even if you're among the super rich. 

Take 17 Upper Phillimore Gardens, formerly a prep school for girls located in London's exclusive Kensington neighborhood. The home features an underground swimming pool, a gym, 10 bedrooms and, of course, a "panic room," lest the proletariat rise up against its owner, Elena Franchuk, a Ukranian oligarch known as a philanthropist and friend to celebrities like Elton John, according to Comparecamp.com, a product reviews and comparisons website. The price tag? $128 million. 

The address brings up the rear on this list that features two homes priced at $1 billion or higher. The other eight residences aren't too shabby, either.