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2019-09-02_12.08.31_WatertonInternationalPark.jpg
The US has its "Glacier National Park".  Canada has its "Waterton National Park".  In between, right at the border (or perhaps including both of the above?), is "Waterton Glacier International Peace Park".  This parking lot is just barely in the US.  You can park here and hike trails that go 20 miles into the US or 20 miles into Canada.