The Mystery of Machu Picchu

A 2007 poll in which 100 million people participated included the Inca city of Machu Picchu amongst the world's new 7 wonders. Machu Picchu is shrouded in mystery, situated as it is on the top of the Andes at 4,000 m (13,300 ft) altitude. At the same time, it could have been an astronomi... [ read more >> ]