Doctor Who's Time Lords.?

I am just getting into Dr. Who. I've been doing some research just so I kind of know what's going on. He's the last of the Time Lords. I'm guessing that the Time Lords can travel through time. Even if they are all dead currrently do we ever see any other Time Lords? If they are time travellers it seems as if Dr, Who would still run into them from time to time since they could travel to the future in which they are dead.