MegaStructures - Willis Tower (Sears Tower) (National Geographic Documentary)

This video looks back into the history and construction of the Willis Tower (formerly Sears Tower), a 108-storey, 1451-foot (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973, it was the tallest building in the world (for nearly 25 years). More than 25,000 people walk into the Sears Tower every day it takes 104 elevators some double-decker to transport workers and visitors to the 110 floors.

MegaStructures - World Trade Center Bahrain (National Geographic Documentary) 11072015

The Bahrain World Trade Center, with its two 50-storey glass 'sails' that are powered by a revolutionary new means for a building of this size ... wind! Architect Sean Kela hopes the shape and orientation of the towers will funnel the wind directly into the turbines path. The tapering shape of the towers also means they will funnel more wind to the lower turbine and less wind to the higher one making all three rotate at roughly the same speed, yielding approximately the same amount of power

MegaStructures - Science of Brick (National Geographic Documentary), 10072015

This video looks at the history of bricks, the production process and its versatility. Weaknesses such as the mortar, its physical weight and the risk of damage due to earthquales is highlighted The video shows the first 40 minutes of this documentary