8. Portugal – Spain
It is one thing to play volleyball on the international border of two great nations, but ziplining from Spain to Portugal just takes things to a whole new level. The zip line here is a little less than half a mile long and may very well be the most exciting way to travel, border crossing or not. As an added quirk, you actually gain an hour of time when you land in Portugal because it happens to be in a different time zone than Spain.
You can see a video of the zipline in action below.
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