Math experts rank a Minnesota destination among the most beautiful in the United States. What is it and where are the others?

After visiting all 63 national parks in the US, my favorites include Yosemite and Grand Teton. I think one of the worst parks is Gateway Arch.

What makes for a great urban park? Today's video explores that questions, then scans the continent of North America, looking for the very best. Our journey will include some obvious stops -- New ...