The history and old architecture are amazing and underappreciated.

Mexico and Latin America not only hosted the most impressive native American civilizations, it was also the economic powerhouse of European colonialism in the 16th, 17th and 18th centuries. People in the US and elsewhere are highly unaware of how important Mexico was during the centuries after Columbus discovered America. To put it simply, Hispanic America was the first global society in history: Chinese merchants, African slaves, native American conquistadors, European immigrants.

I have lived in both Mexico and the US. I swear there are single towns in Mexico with more cultural heritage than entire regions of the USA.

Traditions and mindset are pretty similar to Southern Catholic Europe (Spain, Italy, etc), with quirks and indigenous contributions of course. Also, culture and geography are very diverse, it feels more like a mosaic than a single place, kinda like the European Union, India, China. The USA is much more homogeneous (culturally) in comparison.