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Ariau Amazon Towers, northwest of the Brazilian city of Manaus, sets the standard for treetop hotels. With 288 suites located in seven towers over the Rio Negro, it's the largest commercial treetop hotel in the world. The late explorer Jacques Cousteau came up with the idea of creating a hotel in the heart of the Amazon Rainforest, in the style of the native Brazilians. He shared it with a local hotelier, who decided to make Cousteau's dream a reality. Ariau Amazon Towers' tallest unit, known as the Tarzan House, is perched atop a living Mmahogany tree. It stands more than 72 feet above the grand to capitalize on its views of the surrounding Amazon Rainforest. But this vista pales in comparison to the sights you'll enjoy from the hotel's 150-foot observation towers.