Devil's Gorge is the jewel of the magnificent Iguaçu falls. This trench over 85m/278ft deep that is visible, from the bottom on the Brazilian side, is accessible by a 1km/0.6mi footbridge that allows you to glimpse ruins of foot-bridges since washed away. A veritable menagerie of lizards, caimans, birds, butterflies can be spied all around. The water streams powerfully into this hole in the form of a horseshoe, producing a thick cloud of vapour.