An undulating series of verdant falls on the border of Argentina and Brazil, Iguazu Falls almost puts Niagara to shame, though it has less water running through it.

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Still, perhaps the best, and most eco-friendly, way to view Iguazu Falls is by walking to the trails from the visitor centre and hiking through the jungle's beautiful flora and fauna.

BBC: Eco-scorecard to the world��s great attractions

When Iguazu National Park decided to build a train going up to the world famous Iguazu Falls, some of the most breathtaking waterfalls in the world, in the late 1990s, environmentalists were concerned.

BBC: Eco-scorecard to the world��s great attractions