what is the worlds tallest building?
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Taipei 101, Taipei, Taiwan
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Dubai , UAE.\n\n30 percent of the worlds tower cranes are located here, Just to give u a small idea of the amount of construction going on here.
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The largest building in North America is also the largest building in the world.  It's owned by Boeing aircraft, and is located in Everett, Washington.  It encloses 472 million cubic feet (13.3 million cubic meters) of space.
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The world's tallest hospital is Guy's Tower in London.  It measures a total of 469 ft.
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The CN Tower in Toronto, Canada standing 1,815 ft., 5 inches tall.  It's the tallest free-standing building in the world.
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It really depends on how you define building.\n\nIf it is by highest point (including antenna), then it would be the  Sears Tower in Chicago, USA\n\nBy architectural top (top of roof)? Then it would be Taipei 101 in Taiwan.\n\nHope that helps.\n\nwiki has all tallest structures by category. Check the link below for more.
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Taipei 101 in Taipei, Taiwan at 508 Meters.\nhttp://skyscraperpage.com/diagrams/?1241105\n\n[modified below for more sources and some details on how there are different categories for 'tallest building']\nThe Council on Tall Buildings and Urban Habitat (CTBUH)  defined four categories in which the "world's tallest building" can be measured:\n\n1) Height to the structural or architectural top, Taipei 101\n2) Height to the highest occupied floor, Taipei 101\n3) Height to the top of the roof, Taipei 101\n4) Height to the top of antenna, Sears Tower\n\nToday, the Taipei 101 leads in the first category with 508 m (1,667 ft); in the second category with an occupied floor at 438 m (1,437 ft); and in the third category with 448 m (1,470 ft). The first category was formerly held by the Petronas Twin Towers with 452 m (1,483 ft), and before that by Sears Tower with 443 m (1,448 ft). The second category was held by the Sears Tower, with 435 m (1,431 ft). The third category was formerly held by the Sears Tower with 442 m (1,445 ft).\n\nThe Sears Tower still leads in the fourth category with 527 m (1,730 ft), previously held by the World Trade Center until the extension of the Chicago tower's western broadcast antenna in 2000, over a year prior to the Trade Center's destruction in 2001.\nhttp://en.wikipedia.org/wiki/World's_tallest_structures\n\nThe CN tower in Canada is 'officially' considered the "tallest Freestanding structure on land" .. not the "tallest building (fully habitable)", although some sites will give it this designation in some limited categories.\n\nThe second body that ranks tall structures is "All About Skyscrapers" which divided the comparison of structures into the following categories.\n\nFully habitable-Spire, Taipei 101 Taipei (509m) \nFully habitable-Antenna, Sears Tower Chicago (529m) \nFully habitable-Highest Floor, Taipei 101 Taipei (438m) \n\nPartially habitable-Spire, CN Tower Toronto (452m) \nPartially habitable-Antenna, CN Tower Toronto (554m) \nPartially habitable-Highest Floor, CN Tower Toronto (452m)
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Mauna Kea in Hawaii is the world's tallest mountain from base to peak! Its base is on the sea floor and it rises 33,480 feet (10,314 meters) in total, while Mt. Everest which is located on the border between Nepal and China, not in India like the person "Student" said.  Mt. Everest from base to peak is 29,028 feet (8,848 meters). Mt. Mauna Kea beats Everest by 4,452 feet (1,466 meters). It's true that Mt. Everest reaches the highest, but it's not the tallest.
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Highest mountain in the world is Mount Everest in the Himalyas. It is 8,850 meters high.
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BURJ DUBAI\nin DUBAI\nwill soon become the tallest building in the world!!!
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taller than the second tallest man in the world
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No straight answer to this one. It depends 'exactly' what you define as a building, and whether you count masts and aerials that are on the top blah blah blah.\nHave a look here though for more information::
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The eifel tower is 320.75 m and the space needle is only 184m.\n\nSo the eifel tower is taller
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While determining the world's tallest structure has generally been straightforward, the questions of what is the world's tallest building or the world's tallest tower have often been controversial, both because of disputes over what should be counted as a building or a tower, and further disputes over how to measure the height of these. Questions of national or local prestige may cause different people to adopt different definitions which favour their own structures.\n\n Warsaw radio mastIn terms of absolute height, most of the tallest structures are dozens of radio and television broadcasting towers that are around 600 meters (2,000 feet) tall. There is, however, some debate about:\n\nwhether structures under construction should be included in the list \nwhether structures rising out of water should have their below-water height included. \nFor towers, there is debate about:\n\nwhether guy-wire-supported structures should be counted \nhttp://en.wikipedia.org/wiki/World%27s_tallest_structures#Tallest_structure_by_category\nhttp://en.wikipedia.org/wiki/Tower\n\nNOTE: This list includes only towers.1 For buildings, see World's Tallest Tower  \nCanadian National (CN) Tower, \n Toronto  1975 553 1,815
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You ask which building is LONGEST and not TALLEST. I might be wrong, but I do not think the Great Wall of China would be considered a building, but a structure (wall). I think it could be the longest structure in the world.\n\nMy best guess would be a scientific building (in Texas I think) that shoots a particle beam. It is incredibly long. \n\nThe tallest buildings to the best of my knowledge are the Taipei in Taiwan and the Petronas Towers in Malaysia.\n\n\nI found this data on the web:\n\nBy space (useable volume, in m³)\n\nBoeing claims that its Everett Plant in Seattle, Washington is the largest building in the world by volume at 13.3 million m³ (472 million ft³), having grown from the original 5.64 million m³ (200 million ft³). The building is used to assemble the company's 747, 767 and 777 aircraft, and will be used for the 787. [1] This is backed up by the Guinness Book of World Records.\n\nIn Brandenburg, Germany, the Aerium of the Cargolifter AG was built as a hangar for a never constructed giant airship and has a volume of 5.2 million m³, is 107 m tall, 360 m long and 210 m wide. It's the world largest hall without pillars and is now used as a resort called Tropical Islands.[2]\n\nThe Palace of the Parliament in Bucharest, Romania, Europe, with a total of 2,550,000 m³ or 90 052 400.1 cubic feet. It takes third place in the world total office space (useable floor space) provided. (N.B. Nasa's Vehicle Assembly Building)\n[edit]\n\nBy area (in m²)\n\nBy footprint (m²)\n\nThe chiefly one-storey Aalsmeer Flower Auction, The Netherlands, with its 990,000 m² of floor space is probably the world's largest building in terms of both footprint and floor area. The Guinness Book of Records records it as the largest commercial building in the world. It is located in Aalsmeer, The Netherlands. Around 20 million flowers are sold in the building every day.
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Category Tallest building City Height \nFully habitable structures — Spire Taipei 101 Taipei 1,671 ft (509 m) \nFully habitable structures — Antenna, Sears Tower Chicago 1,736 ft (529 m) \nFully habitable structures — Highest Floor, Taipei 101 Taipei 1,437 ft (438 m) \nPartially habitable structures — Spire, CN Tower Toronto 1,481 ft (452 m) \nPartially habitable structures — Antenna, CN Tower Toronto 1,816 ft (554 m) \nPartially habitable structures — Highest Floor, CN Tower Toronto 1,481 ft (452 m)
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What is the world's tallest mountain from base to peak?\nMauna Kea in Hawaii is the world's tallest mountain from base to peak! Its base is on the sea floor and it rises 33,480 feet (10,314 meters) in total, reaching 13,796 feet (4205 m) above sea level.