The Titanic pushed the boundaries of engineering and luxury like never before, but it's also the most well-known disaster; experts use cutting-edge tech to discover if a modern vessel of equal opulence could be successfully built for the sea today. 

Machu Picchu is one of the greatest landmarks of world architecture, yet the purpose of its construction and how it was built still remains a mystery; experts use cutting-edge engineering to reveal what it would take to rebuild this legendary city.