Yes, you can walk and view Niagara Falls for free on both the American and Canadian sides. On the U.S. side, Niagara Falls State Park is open 365 days a year and does not charge an entrance fee for pedestrians to walk the grounds and see the falls from various vantage points like Prospect Point or Terrapin Point. On the Canadian side, the Niagara Parks promenade offers a world-class, unobstructed view of the Horseshoe Falls entirely for free. While walking and sightseeing are complimentary, specific attractions that take you "into" the action—such as the Maid of the Mist boat tour, the Cave of the Winds (US), or Journey Behind the Falls (Canada)—require a paid ticket. Parking fees also usually apply if you drive to the state or provincial parks, but for those walking in from nearby hotels or public transit, the natural spectacle itself costs nothing.