How Did They Build That?

In Oklahoma, a sacred spiral mound rises on a former oilfield, honouring 39 tribes. London's crumbling Battersea Power Station is reborn with two million new bricks. And in Spain, Frank Gehry crowns a historic winery with floating titanium ribbons.

Milwaukee commissions Calatrava to design a museum with 90-ton wings that take flight. Oslo tears down its national ski jump and rebuilds it for the World Championships. And in LA, a 235 foot tower is wrapped in steel bands to withstand earthquakes.