Entry fee
Around $29.24 but varies with site.
Visiting instructions
1.) You have to present your original ID card or passport to access the monumental complex.
2.) They are very strict on punctuality.
3.) It can get really hot so you should drink plenty of water and in case the one you carry is not enough, there are drinking fountains.
4.) Wear sunscreen, a hat, or similar, and keep in the shade offered by the abundant vegetation in the monumental complex.
5.) Allow at least half a day, or more if you can, You won't regret it.