In the 1920s, developers planned a “Venice of the North,” to be called Lake Forest. That land is now part of the Arboretum. Hike to the site of the failed subdivision, discovering construction remnants along the way. Tour entails stepping over obstacles. Free, space is limited. Advance registration is required and opens October 1: https://arboretum-lost-city-tour-2022-tour-1.eventbrite.com. Registration closes October 26 or when full. Meet at the Visitor Center. See also November 6 tour.