19. Star Dune, Colorado
This great golden sand dune is one of the main attractions in the Great Sand Dunes National Park and Preserve. These protected sand dunes are reportedly the tallest on the continent. They reach heights of over 740 feet. Star Dune is the tallest at 741 feet.
20. Niagara Falls, New York
Niagara Falls is not the highest or the largest waterfall on Earth, but it’s the most famous. Located in New York State near Buffalo, three thunderous cascades of water splash across the border into Canada. The water here has a distinctive blue-green tint.
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