The KVLY-TV mast (formerly the KTHI-TV mast)transmitting tower in North Dakota North Dakota at 2063' (628m) it is the tallest man-made land-based structure in the world. Only the water-supported Petronius Platform The Petronius Platform is a deepwater oil rig operated by ChevronTexaco and Marathon Oil in the Gulf of Mexico, 210 km South-east of New Orleans.
A compliant piled tower design, it is 610 m (2,001 feet) high, the tallest free-standing structure in the world (when including underwater structures). (See also: World's tallest structures.) It is 2,100 ft (640 m) to the top of the spire, which makes it taller than all structures but a few TV masts. The multi-deck topsides are 64 m by 43 m by 18.3 m high and hold 21 well slots, the entire structure weighs around 43,000 tons. Around 8,000 m� (50,000 barrels) of oil and 2,000,000 m� (70 million cubic feet) of natural gas are extracted daily by the rig.