Simple? I think that's more of a misnomer. You can say the concept is simple, but think about it. Tickets just cost a lot, and then there's the scheduling, the cost of hotel (you can't just go all the way there without some sight seeing!), rent on car, and then you don't nessarily have to get a bank account, you can just exchange US dollars for Euros. In all, it should cost about close to thousands, though it kind of depends where you go and who's coming with ya.
MICROBES: Cute, yet... deliciously EVIL!
Of course, not counting our good nonpathogenic microbes! (but they are still just as cute!)
We may be gone, but the history is still here.