Sure, only imaginary lines inside the "imaginary lines" that define the country you currently reside in :)

nullama

What is a border? An imaginary line, right?
Yes I traveled to various places, without carrying a passport.

btw, my country being my own body have very clear defined "borders", not just imaginary lines.

DarthCoin

AskSN

Do you OWN your name ?

So, in practice, have you ever crossed a border without a passport?

Because, even ambassadors have a passport. It's different, sure, but they need to carry a [diplomatic passport](https://en.wikipedia.org/wiki/Passport#Diplomatic_and_official_passports) to cross an international border.