Music mogul David Geffen is now the sole owner of Rising Sun (above), the world's sixth largest yacht, having seized control from co-owner Larry Ellison. Originally commissioned by the Oracle billionaire from Germany's Lürssen shipyard in 2004, the 456 ft. megayacht cost about $250 million to build. After gaining possession of the craft – the terms of the deal have not been disclosed – Geffen has sent the boat back to Lurssen for some much-needed modifications while Ellison prepares to take delivery of a much smaller 298-ft. superyacht. Considerably bigger than other billionaire boats like Paul Allen's Octopus, the Rising Sun features luxe accommodations for 12 people in addition to 30 crew members and boasts a total of 82 rooms on five decks. Onyx countertops, a gymnasium, spa, sauna, wine cellar, private cinema and basketball court that converts to a helipad are some of the over-the-top touches onboard. Four MTU 20V 8000 M90 diesel engines with a combined output of 50,000 hp move the massive yacht along at up to 28 knots.