Garganta del Diablo (The Throat of the Devil) at Iguazu Falls — from the Argentinian side, you walk about a mile on the walkways (from the upper right) to look right down the center of the falls. An incredible experience!
Iguazu Falls, Brazil are waterfalls of the Iguazu River on the border of the Brazilian state of Paraná and the Argentine province of Misiones. The falls divide the river into the upper and lower Iguazu. One of the 7 natural wonders of the world