In Miami, years of work to build a 10-mile urban trail and linear park below elevated public transit train tracks are nearing fruition. The Underline is slated to be complete in 2026, but it’s already opened some of its paths and recreational areas to pedestrians, cyclists and other visitors. The first half-mile opened in 2021, and another more than 2 miles opened in spring 2024, bringing hydration and bike repair stations, free WiFi, public art, bioswales, outdoor gym space and a 50-foot communal “dining room” table to the stretch of land.