Skylight Cave in Oregon. Skylight Cave is actually a lava tube, a hollow tube that was formed by lava flowing through a cooled f ...

R. R. Tolkien's Lord of the Rings, this is it. I finally fell upon the idea of lighting the cave from the inside. If light were coming from the back of the cave it would suggest the experience of ...

A group of divers have connected two underwater caverns in eastern Mexico to reveal what is believed to be the biggest flooded cave on the planet, a discovery that could help shed new light on the ...