This always blows my mind.
The stuff we can't quite explain that we discover from lost civilizations is fascinating. One of those is the hypogeum in Malta. https://www.smithsonianmag.com/travel/maltas-hypogeum-one-worlds-best-preserved-prehistoric-sites-reopens-public-180963397/
Experiencing discoveries like that slaps you with the realization of time having passed between then and now.
I DEFINITELY have to experience the terracotta army at some point.
Wonderful.