Feeling ambitious? Travel to all historic sites in the U.S. in one 50K mile road trip

I recently learned about a history professor who decided to map the most efficient route to traveling all of the sites on the U.S. Historic Register.  Now, that’s my kind of ambition.  Read more about the map here and check out the map itself here:

http://www.math.uwaterloo.ca/tsp/us/index.html

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