Carthago delenda est! That's how us noob Latin language students learn the gerundive, with "delenda" being a verbal adjective, meaning "to be deleted (destroyed)". As a bonus it's also useful as a paradigm for remembering how the passive periphrastic conjugation works. It helps that it also implies violence and destruction, making it easier to remember.

When holidaying in Italy I had the luck to pick the day trip one day. Really glad I found Paestum (an ancient Greek city): it is every bit as captivating as Pompeii imo.