Photo source: populous.com

6. FFR Grand Stade, Paris – The two million-square-foot venue will become one of the largest stadiums in all of Europe, including serving as the largest roofed entertainment venue. And one of the most moving. It took 4 years to build costing $552 million. This stadium has retractable roof & field; just put together and add 82,000 seats and the rugby federation of France will have a nearly mobile stadium on a giant scale located south of Paris.

Source & photo credits: www.popularmechanics.com