climbing pyramids

Mexico is an old country and has a long diverse history. We visited the pyramids outside of Mexico City at Teotihuacan, called the pyramids of the sun and the moon. There was major city here for 700 years from the time of Christ, before the Aztec or Maya. There were alot of civilizations that interacted with each other throughout central America.
The climb wasn't too bad, like walking up out of the subways. Still it a special feeling being on something so old that still has a kind of energy about it. My back had been aching sitting in the mini-van as we toured around, and either the climb or the special psychic power of the place made it feel better.