Adding cities to your watchlist
On any city page, click the star/watchlist button. If you're signed in, the city is saved to your account. If you're browsing without an account, it's saved locally in your browser.
Viewing saved cities
Go to the Trips page to see all your saved cities in a grid below your trip plans. Click any to go straight to the city page.
Managing your watchlist
Add or remove cities anytime from the star button on a city page. Saved cities are just a shortlist to come back to, there's no cap to worry about; remove ones you're no longer considering to keep it tidy.