There's a great movie called "Powers of Ten" from 1977:
https://www.youtube.com/watch?v=0fKBhvDjuy0
It "only" goes out to 10^24 metres (100 million light years), but a bit of quick maths tells you that the scale of the observable universe is "only" about two orders of magnitude bigger (10^26 metres or ~10 billion light years).
10^0 metres (= 1 metre) is the order of magnitude of a human being.
The movie then zooms in to 10^-10 metres (the scale of an atom), 10^-14 metres (the size of a proton), and finishes at 10^-16 metres, where you're getting down towards the scale of the most fundamental theoretical particles.
9 minutes that everyone should watch!