Anime that never gets old is Elfen Lied.
This one is really great I rewatching so many times alredy and now that I'm writeing about it I fell like watching it again ^^ Everytime I watch it I'm shocked how something can be so beautiful and at the same time probably the most violent anime I've ever seen. I've cryed every episode everytime I rewatched it.
Also the opening is so geat with the artworks and the opera song oh amazing *__*
p.s. people who read my challenge probally now think that I'm huge crybaby since I beleve I wrote that I cryed alot actually the truth is I rearly cry accept when I watch anime then yeah I'm crying all the time XD