Of course there are caves outside Earth. If there are other planets in the universe, why should there be no caves? Unfortunately the amount of information about those remote caves is really low. So we tried to collect any bit of information here. The result may seem a bit higgledy piggledy, but its the best we could do. This site is about touristic caves and mines. And of course it is very unlikely that any tourist will visit a cave on Mars in the near future. But still we think it might be interesting for you to hear about them.