Featured in lava tubes
These astronauts are preparing for life on Mars by living in Hawaiian lava tubes
The caves are an excellent facsimile of lava tubes on other planets.
Newly Discovered Network of Moon Tunnels Could House Lunar Colonists
The moon may be a harsh mistress, but lately she has been giving up her secrets. Scientists have spotted a...
What Would You Do With Your Mountain Fortress?
Hollowed-out mountains are good for so many things. They can house strategic military bases. They can store toxic waste. And...
How Did the Spouting Horn on Kauai Come to Exist?
The spouting horn is a remnant of activity that has occurred intermittently between 500,000 and 3.6 million years ago.