Geo Checklist is a simple way to track the places you have been. Pick a curated list — US states, UN countries, MLB stadiums, the wonders of the world — and check off each location as you visit it.
Each checked item can carry a short note so you remember when you went and what stood out.
You do not need an account to start checking things off. Your progress is saved in your browser, and the moment you create an account it transfers over so you can pick up on any device.