Civilization V: Who/What Am I?

Here's the second clue. I'm going to bed now, so forgive my delay in responding. I'll give three clues, though, to make sure someone gets it...

Clue #1: You shall be rewarded for your great deeds, but only if you have what it takes.
Clue #2: Sturdy resources of antiquity keep the coffers flowing when I'm around.
Clue #3: In life, I am no more; only one of my six siblings still stand.
 
Uhps, sorry, someone else guessed my guess, so I'd say (if I'm allowed) the Colossus, though I guess cpm4001 guessed right.
 
Nope, not the Maya, though part of the clue technically does refer to them.
 
No to all of the above. One more guess and I'll give out the second clue.
 
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