Net Worth: $47 billion
The world’s third-richest man still resides in the 6,000-square-foot, five-bedroom gray stucco home he bought in 1958 for $31,500. The home has everything the 79-year-old needs, including his very own handball court that he uses to keep fit. An intruder armed with a fake gun tried to break into the modest, ungated property in 2007 but was ultimately thwarted by security.
Net Worth: $53 billion
Gates’ 66,000-square-foot compound is built into a hillside on the edge of Lake Washington, near Seattle. Its enviable amenities include: a 60-foot swimming pool with an underwater music system, a 2,500-square-foot gym and a 1,000-square-foot dining room, which seats 24. For a personal touch, out-of-shape visitors can skip the 84-step hike to the ground floor and opt for an elevator ride instead.
Net Worth: $28.7 billion
In 2004 Mittal paid $128 million for his 12-bedroom townhouse in London’s luxe Kensington district. Mittal’s mansion, tucked between Kensington Palace and the Sultan of Brunei’s spread, has an indoor pool, Turkish baths and garage space for 20 cars. The super-home is also embellished with marble taken from the same quarry that supplied the Taj Mahal.
Net Worth: $28 billion
Over the last few years the Oracle co-founder has dropped $200 million by some estimates on near a dozen properties in Malibu to create a custom compound. His 23-acre estate in Woodside, pictured here, is inspired by the Japanese city of Kyoto and is reminiscent of a 16th-century imperial Japanese palace. It reportedly cost upward of $200 million to build.
Net Worth: $13.5 billion
Built in 1997, Dell’s 33,000-square-foot hilltop manse sits on a 20-acre spread close to where he founded his eponymous computer company. The eight-bedroom house equipped with a conference room and both indoor and outdoor pools is known locally as “the castle” thanks to its high walls and tight security.