Building the Sheikh Zayed Bridge, the stunning grand gateway to the world's richest city, Abu Dhabi, capital of the United Arab Emirates, is a king size headache for Mark Jones, the engineer assembling its giant signature arches. "It's an architect's dream, an engineer's nightmare," he says .The bridge is millions over budget and years behind schedule. It's as much sculpture as structure, and when art meets engineering, worlds collide. No one has ever built a bridge like this. Mega Builders cameras follow Jones and his crew as they solve one frustrating challenge after another, lifting and joining together 600 tonne steel segments bigger than houses with the largest crane in the Middle East to complete the South Marina Arch at the world's most difficult bridge.