San Francisco’s Salesforce Park is an amazing modern marvel in the Financial District, resting 70 feet above the street atop the Salesforce Transit Center, and it’s completely free and open for the public to visit at any time. It also hosts a collection of free events every week, including yoga classes, bootcamps, live music, bird walks, garden tours, drum circles, and much more. If you have yet to visit, consider checking out their event calendar for a one-of-a-kind experience.