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Volcanic activity has created some of the most colorful and extraordinary landscapes, including hot springs, colored lakes and a soft volcanic rock that is easily eroded and shaped by the forces of water or wind.

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As this immense project nears its completion, take a look at some wonderful photos taken both onsite, around, above and below the Hoover Dam Bypass Bridge. It cannot be said that the golden age of engineering is over when we can still produce projects like this.

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The Saguaro cactus, found in Mexico, Arizona and some parts of California is a giant among its type, growing to the size of a tree. It also gets a number of house guests during its life time.

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This is about the Rattler of Arizona.

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Announced in 2004, the Hoover Dam Bypass Bridge has been five years under construction. Due to be completed in 2010, the bridge has slowly been taking shape. Here, with some amazing photographs is a record of this incredible bridge as it nears completion.

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A look at some of the geological wonders that this wonderful planet of ours holds.

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An amazing natural sandstone formation located in Arizona near the Utah border is an amazing and surreal place. Looking at the images you almost do not believe what you are actually seeing is real or even possible!

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The majestic Saguaro cactus is an icon for the American southwest and the state flower for Arizona, USA. It is a home for birds, food for many desert animals, and an enigma to many who seek to apply logic to all things.

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A U.K.-made unmanned solar-powered spy plane has shattered an unofficial world record by staying in air for over three days. The plane called Zephyr-6.

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Only a few of the heavenly falls in the world.