668 Ancient Ohio Trail; Endangered Places 2022; Atlas Obscura Curiosities

Learn about the Ancient Ohio Trail and its cluster of mysterious geometric earthworks left behind by pre-Columbian "mound builder" cultures. Then find out which cultural treasures — architecture, landscapes, townscapes — have been added to the World Monuments Fund's most recent list of endangered sites. And hear about some of the more curious places and things held dear by people around the world.