Back when I was a kid, I saw lots of tunnels, lava tubes and caves. From Minnesota, to Hawaii, to Oregon, and Washington. I love exploring caves. When I was about six my parents took my sister and I to see the tunnel carved into a cliff in Oceanside, Oregon. This tunnel was the only way to get to Tunnel Beach, that is without a boat. Well the tunnel is open off and on, but closes now and again due to rockslides, cave-ins and other erosive dangers. Here is a a 3D shot of the tunnel from 2010.