I wouldn't recommend visiting multiple countries on a short trip, though. You need at least 1-2 weeks to really start getting to know the country you're visiting.
Anything shorter and I feel you're rushing your trip.
I’m from Canada, and it takes 10-11 hours to get from Vancouver to Calgary by car
When I got to Prague I realized I could get to Paris, Berlin, Amsterdam, Rome, Brussels, even London and a dozen other major cities in less than 10 hours
If you start in Columbus, Ohio large cities like Indianapolis, Chicago, Detroit, Milwaukee, Cleveland, Cincinnati, St. Louis, New York City, Philadelphia, Washington, D.C., Baltimore, Pittsburgh, Nashville, Louisville, Charlotte, Atlanta, Toronto, Boston, Providence, Richmond, Raleigh, Harrisburg, Montreal, Albany, Syracuse and Buffalo are all reachable in less than 10 hours.
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u/Pac_Eddy 5h ago
How many countries you can visit on a short trip.