Gorges de l'Areuse, Switzerland The Val de Travers is a Jura mountain valley perpendicular to the main valleys (hence the name). The river Areuse has cut itself steeply through the soft limestone and clay sediments. It's one of those Roman bridges too.
Walk the jungle tree tops in Costa Rica. Arenal Hanging Bridges, Costa Rica - A three kilometer hike through the Costa Rican rain forest. There are six suspension bridges, with the largest one at just under 100 meters long and 45 meters off the ground.