When it comes to travel, Machu Picchu is synonymous with Peru. Voted five years ago as one of the new seven wonders of the world, the view you get as soon as you arrive is breathtaking. This Inca citadel was built during the 15th century, but remained unexplored until 1911 when Hiram Bingham found it, all overgrown by the rain forest. The reasons it was built and why it was abandoned are still a mystery. Here's what you need to know for your visit, including where to stay and how to get there.