At the Spring Mountain ski area, in Schwenksville, Pennsylvania, visitors cut through the deep forest on a challenging combination of swaying sky bridges, cable traverses and zip line pathways.

The tour starts with a ground school where adventurers practice the skills they’ll need on the course. This outing, called the Vertigo Tour, runs a little more than two hours and is offered year-round.

The tour concludes with a 339-foot zip line that thrusts riders out of the forest, over a grassy ski run and onto the platform of a 45-foot climbing tower.

The picture displays two members of the group climb up a cargo net to the first platform of the zip line course. About two dozen canopy tours now operate in the United States. Pennsylvania is a state in the Northeastern and Middle Atlantic regions of the United States.