Temple of the Warriors
El Caracol Observatory. Although there is no high powered telescope. The ruling class understood the earth's seasonal and celestial patterns and used that knowledge to "predict" seasons of draught and rain and even recognizable celestial events; thus creating the illusion that they were in tight with the Gods.
The Castle. That is what they call it now. It is a temple built over the top of a previous temple. One can go inside and climb to the top of the inner temple provided they are not claustrophobic.
