Atlanta's Mercedes-Benz Stadium is the world's most advanced stadium and features the most complex retractable roof ever built. As the team races to finish the $1.6 billion arena for the NFL season, it faces deadly winds and unique engineering challenges.

Expert engineers try to build one of the largest and most advanced cruise ships in the world. This goliath ship will carry over 5,000 passengers and pushes the boundaries of ship design and construction.

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.

Engineers race to complete the longest suspension bridge in the Arctic Circle before the brutal winter arrives.

Venice's new storm wall is one of the strongest in the world, a 330-ton behemoth that protects the historic city from disastrous flooding.

Engineers are building a ground-breaking new railway line in Copenhagen that features 22 miles of tunnels, 17 brand-new stations, and cutting-edge driverless trains.

The world's tallest church has taken more than 140 years to build, and today, engineers are nearing completion of Barcelona's Sagrada Familia, designed by maverick architect Antoni Gaudi.