Along Australia's Gold Coast and across the French Riviera, they sit above the beach offering extraordinary views of the sea. In the U.K. they are palaces that humble the Queen's Belgravia mansions.
Others range from landed estates throughout continental Europe to nature preserves in Zambia.
These are some of the world's most expensive properties, and the prices are as unique as the homes. Saudi Prince Bandar bin Sultan's Aspen ski lodge lists for $135 million, while 6,000 miles away, a 64-room Istanbul waterfront mansion asks $100 million.