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Engineers are building a ground-breaking new railway line in Copenhagen, Denmark, that features 22 miles of tunnels, 17 brand-new stations, and cutting-edge driverless trains.
In Venice, Italy, a new 330-ton storm wall, part of the MOSE Project, is one of the strongest in the world, and it was built to protect the historic city from disastrous flooding.
In Barcelona, Spain, the Sagrada Familia has taken more than 140 years to build; today, engineers are nearing completion of the world's tallest church (565 feet), designed by maverick architect Antoni Gaudi.
Building Giants showcases how key technological innovations enable giant superstructures to be built. Footage filmed during construction along with CGI reveal the building process with astonishing detail.