What does 'When in Rome, do as the Romans do' mean?

Meaning 1:

This idiom means that when you are visiting a different place or culture, you should try to follow their customs and practices.

• Category: Place name

Meaning 2:

This means that you should adapt to the customs of societies when you visit them, or behave in an appropriate manner according to how people around you behave. It is often shortened to "When in Rome".

• Category: Place name

Idioms similar to 'When in Rome, do as the Romans do'

• When in Rome, do as the Romans do
• Rome was not built in a day
• All roads lead to Rome