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They tower over urban landscapes, spread across city blocks and span mountainous regions, each a modern marvel. This series showcases how the world's most remarkable superstructures are built, with construction footage and CGI.
Following the race to build the world's next generation of engineering wonders - structures and machines that are more ambitious and more advanced than anything that has ever been seen.
In Liverpool, England, a 52,000-seat stadium is under construction on a former dock.
In Germany, engineers battle groundwater, tight spaces and complex logistics to build Frankfurt Airport's Terminal Three, a mega hub designed to handle 19 million passengers a year.
In Poland, engineers contend with unstable mountains and methane gas while constructing a new high-speed railway through the Carpathian foothills.
In Greece, engineers want to build the country's first real skyscraper; they have to take into account earthquakes, unstable ground, and strong winds from the Mediterranean.
The most cutting-edge venue in the world, Atlanta's Mercedes-Benz Stadium, hosts the greatest athletes in the world, and engineers show how this state-of-the-art arena was designed and constructed.
Engineers use cutting-edge technology and the latest construction methods to build the world's longest underground railroad.
Atlanta's Mercedes-Benz Stadium, the world's most advanced stadium, features the most complex retractable roof ever built; the team races to finish the $1.6 billion arena for the NFL season.
Engineers build a cutting-edge skyscraper in a busy area of New York City; this impossibly tall and thin tower must be built with a strange diagonal framework, posing unique challenges for some of the world's best builders.
Venice faces the threat of flooding if there is a powerful storm in the Adriatic; construction begins on a gigantic storm wall to save the city, but the project goes beyond protection and attempts to repair the damage that has already been done.
In Barcelona, Spain, the Sagrada FamÃlia has taken more than 140 years to build; today, engineers are nearing completion of the world's tallest church, designed by maverick architect Antoni GaudÃ.
Engineers are breaking records as they build Beijing's tallest skyscraper, a 1,500-foot-tall behemoth designed to withstand one of the world's most dangerous earthquake zones.