Often referred to as the "Lost City of the Incas", Machu Picchu is still standing in the middle of a tropical mountain forest, in an extraordinarily beautiful setting. It is considered the most amazing urban creation of the Inca Empire at its height. These are the most mysterious ruins you could imagine, rather posing questions than giving answers, they are one of the most intriguing destinations on the planet. Separated into three areas - agricultural, urban, and religious - the structures are arranged so that the function of the buildings matches the form of their surroundings. This is certainly one of the top must-see-before-you-die places on earth.