Sustainable Tourism is an important element of WMF’s work and a critical message around the world as heritage sites balance protecting fragile, historic materials and providing a safe and pleasant experience for tourists. High tourist season at Angkor brought some unexpected problems to ongoing conservation at Phnom Bakheng, one of the oldest temples in Angkor Archaeological Park. Hordes of tourists disregarded barriers, multilingual warning signs, and guards, climbing onto and over delicate brick shrines, a fragile stone wall, and approached active work areas to have a view of the sunset.