Most of the world's most amazing sights have not been made by people .Nature has some of the best attraction.One of the most beautiful places is Niagara Falls ,which plunges into a canyon about 11 km long .It has a rainbow as the water chases the sun's light and crash down into the steamy canyon below .

In Arizona ,the Colorado River has steadily been giant canyon for about 6 million years.The valley is so deep and steep that nearly a million tourists visit and take the trip down its deep sides every year.

through the heart of South America runs the Amazon River.In some places it feels like a sea .as you can't the other side .Starting in Peru and continuing all the way across Brazil to the Atlantic Ocean ,It is the second longest river in the world after the Nile
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