The engineerguy channel has videos about topics like the alignment optical telescope used on the Apollo missions, that allowed them to fly to the moon.
While I am a fan of engineering videos, especially "How It's Made", the engineerguy videos help me appreciate the complexity and ingenuity that went into some designs that we may take for granted.
Just to warn you, sometimes he will be explaining how something works and he will go into fill engineer mode, using technical language that most people will not understand. If there are things he mentions that you don't get, don't worry, just keep watching, it's only something that people with a PhD in a scientific field will care about. You can still pick up on what he is talking about without understanding everything. Just don't be intimidated by technical language.