I was there . It's okay . <br>But what really had me interested (as a becoming engineer) was this huge self supporting structure.  It's baffling when you're standing inside it and look up. Really cool,(reply>), @exgangster 843 look up their site: Tropical island (or plural). Been there too, two days, stayed in one of the tents, but they also have villages with houses. One looks and feels like something from Pirates of the Caribean, the other felt more tribal. Quite affordable, but I did not look at the exact prices, went with a group and did several more interesting trips that week, total price was not more then a regular holliday,(reply>), @DrKampfpudding so how much is th ticket?,(reply>), @Lord Omacron Luckily the structural concerns would kinda evaporate on mars. The presure gradient would do all the "heavy lifting" in that regard. So the vacuum tightness would be the main concern. Luckily keeping an overpressure in is slightly easier (tensile) than keeping in an undepressure.,(reply>), @Laika Pupkino airtight would not be enough it would have to be Vaccum Tight which is just a tad harder to achive,(reply>), I had been there when there was hope, that those cargo airships would be produced and fly. A friend of mine was an engineer there. It was most impressing...