So there's this story I remember reading many years ago--a short story or novella; it was in a collection of best-sci fi stories of the decade or something like that (or it was an author's collection--I can't remember which.)

All I remember is that it was about a guy who either invents or discovers a time machine--he uses it to jump through time, sees how history plays out--from wars to alien contact, etc. Then he discovers that, while he can jump forward in time, it takes too much energy to jump backwards. So all he can do is jump forward, millions and millions of years, stopping every so often. Eventually (I forget how) he end up looping back around in time, and back at the almost exact moment he left, in his own time.

Does this sound familiar to anyone? Can you tell me the name of the story?