I wouldn't say alien looking (what with the problematic history of such claims) but the Ellora Caves are cool. Carved out of rock, and looks even more elaborate than Petra.
I'm running the premium pack with interactive Beanis addon and though together with the targeted ads it's pushing the limits of what my system can handle I think it's worth the extra cost
IIRC for N2 you only need to know around half of the regular use kanji, and even passing N1 doesn't necessarily mean that you can hold a conversation in Japanese.
I wouldn't say alien looking (what with the problematic history of such claims) but the Ellora Caves are cool. Carved out of rock, and looks even more elaborate than Petra.