 If you liked
Tenkuu no Escaflowne
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 ...then you might like
Code Geass: Hangyaku no Lelouch
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Both of these wonderful series are very unique among mecha anime, in that they do what most don't do that often: Mix two polar oppisate genres (Science Fiction and Fantasy), and do it wonderfully well. The mecha desgins for both have a royal, fantasy asthetic to them, and both shows have very eleborate settings and well developed characters and themes. Even if you aren't particularly interested in mecha anime as a genre, you will find something to like in both of these.