People have flocked to historical sights for as long as tourism has existed. Some of the most visited destinations of the world are directly associated with an ancient civilization or home to a ruin. The greatest constructions of mankind attract millions of tourists to remote corners of the world each. With the naming of the new world wonders in 2007 that exploration of human history has jumped ten fold. Renewed interest in sites like Machu Picchu in Peru and the temples of Angkor in Cambodia are only the start.