The Koh Ker temples in Cambodia offer a fascinating view of pyramids, sanctuaries, palaces, moats and tombs built by Jayavarman IV, ruler of the Khmer Empire in the 10th century. But as peaceful and secluded as these ruins are, signs warn of dangers buried in the surrounding jungle. When Pol Pot, the ruthless dictator of the Khmer Rouge, was overthrown in Phnom Penh in 1979, his army planted land mines which he called “the perfect solders” because they were always ready to explode. Approximately three million have been cleared, but up to six million remain. They still kill hundreds a year, usually boys, and have caused 40,000 amputees. So, don’t wander off the beaten path … literally.