[The World's 20 Most Amazing Tunnels] Sequoia National Park Tree Tunnels, United States

 

 

 

Along Crescent Meadow Road inside California's Sequoia National Park, visitors can drive through the fallen tree known as 'Tunnel Log,' which fell across the road in 1937. The following summer, the tunnel that's become famous today was cut through the tree's 17-ft.-wide trunk. (PunkToad/flickr.com)