I love historical ruins , grew up visiting them in the UK , Ireland , Scotland , Wales and France during my childhood then spent a lot of my late teens and twenties exploring archeological sites in Mexico (sometimes every other weekend I was visiting a new site).
Personally of all of them , its the Mexican Prehispanic ruins which interest me most but although the Mayan sites in the country and in Guatemala are the most impressive visually and I love visiting them for some reason its the Central Mexican sites that interest me most.
Xochicalco - Just a really beautiful site in very beautiful (but arid) scenery and probably one of my favourites of all the sites I’ve visited, have visited several times. I really love the Mayan style stelae with the plumed serpent and the seated lord / warrior.
Cacaxtla - The murals are simultaneously beautiful in their vibrant colours but horrific in the violence portrayed (slit throats , disembowelment , bludgeoning of heads etc.). Plus they are a total enigma , no one really knows who the mysterious civilization who constructed the temple buildings and created the paintings were and to top it all , they are one of the least visited historical ruins in Mexico and really deserve to be seen by more people.
Teotihuacan - This is really one of the most fascinating places of all the MesoAmerican sites. Everything here is superlative. Two gigantic pyramids dedicated to the sun and the moon tower up into the sky and countless smaller ones are dotted around everywhere. There are the painted murals that either depict enigmatic and mysterious gods or ferocious creatures like jaguars , rattlesnakes, wolves , coyote and eagles or beautiful ones such as the resplendant quetzal bird or the swallowtail butterfly.
El Templo Mayor - The ruins of the great temple of Tenochtitlan in the Zocalo , the religious and political centre of the Aztec empire, these ruins are imbued with a really poignant and sinister and bloodthirsty energy / aura that is palpable , just totally saturated in history. Walking around here you are confronted with the stone carved imagery of skulls and giant ferocious serpent gods.Thousands of people were sacrificed here walking up the hundreds of steps of the pyramid that would have rose up into the sky to have their still beating hearts torn out of their chest by a high priest wielding an obsidian bladed knife as an offering to the serpent gods who were believed to be nourished by blood. Then the conquistadors arrived and engaged in their own wanton genocidal butchery of civilians too to satisfy their own psychopathic bloodlust and brutal tyranical god who also demanded submission and slaughter.
Tula - This is another site that a lot of people tend to miss out on , I suppose because it’s a bit out of the way , but if you get the chance then you should definitely visit as you wont regret it. You walk across sunbaked scrubland dotted in cacti and agave to a pyramide platform topped by the gigantic stone effigies of fearsome warriors and whose base is covered in imagery of beasts like jaguars , puma, wolves , coyotes and eagles devouring human hearts. This was the religious and political centre of the Toltec empire , the forerunners of the Aztecs , it is really a sight to see.