Standing atop the ramparts of China's Great Wall. Snorkeling the Great Barrier Reef in Australia. These are the giants of our collective imagination, the plumes in our travel cap. Though they might seem timeless, many of the world's most treasured sites are in peril, threatened by theft, development, climate change, or unsustainable tourism.
Featuring some of the world's most popular destinations, our picks draw from UNESCO's World Heritage in Danger list as well as Disappearing World: 101 of the Earth's Most Extraordinary and Endangered Places by Alonzo C. Addison. From ancient cities to virgin rainforests, we hope these wonders stick around to inspire future generations.