Which is an example of Peter the Great's legacy?

He expanded Russian territory.

He created a more democratic monarchy.

He established Russia's first warm-water port

He put an end to all serfdom.

He modernized the country, importing western technology and ideas. He also turned it into European power, by defeating Sweden (a local superpower of that day) in the Great Northern War. Finally, he established royal authority over the church.

Other, minor reforms, included having the nobility shave their beards. Finally, and perhaps most famously, he built the city of Saint Petersburg, later Leningrad, now Saint Petersburg again.

On the negative side, he was a paranoid tyrant who solidified Czarist absolutism, but as Lenin later said, to make an omelette, one has to break a few eggs.