"The Rainbow Bridge connects the American and Canadian sides of Niagara Falls, and it's not just for automobiles. Pedestrians can cross the bridge and enjoy the view as they go, possibly spotting a rainbow or two in the mist. Note that you do need a passport to cross this bridge, and there's a $1 toll. If you're interested in shopping, duty-free shops line both ends of the bridge." - Travel + Leisure Editors