Is there anywhere along the world’s longest undefended (but closed) border where people can meet legally?
Why, yes, there is: Peace Arch Park. The recently reopened park is between Blaine, Wash., and Surrey, B.C. and is a shared territory for citizens of both countries to visit. The southern half is owned by Washington State Parks, the northern by British Columbia Provincial Parks. Entries and exits are patrolled, but as long as visitors stay within the 42-acre area, they can roam freely.