19 of America's most surreal travel destinations

Shutterstock/Dancestrokes America is home to some of the world's most unique sites.  From massive underground caves to rainbow-clad natural formations, the country is teeming with breathtaking spots that leave travelers in awe.  We've put together a collection of 19 such sights to visit in the US, from the world's largest gypsium dunefield to shimmering ice caves hidden within a glacier. Get ready to explore the wild terrain of the states.  The Grand Prismatic Spring in Wyoming's Yellowston...