Monday, June 29, 2009

Rushmore Cave

We visited Rushmore Caves today, it was discovered back 1876 gold rush. They are still discovering new passages today. The Black Hills are home to the 2nd largest cave system in the US. The Black Hills are one of the oldest mountain ranges in the US. Geologists believe this cave, with its world-class big room, began forming 60 million years ago.

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