The border between Spain and Morocco. Spain has two exclave located on the north coast of Africa, Ceuta and Melilla.
Every year ten of thousands of africans try to cross the border jumping over the 7m high fence.
Wikipedia:
http://en.wikipedia.org/wiki/Melilla_border_fence http://en.wikipedia.org/wiki/Ceuta_border_fence
Images:
https://www.google.com/search?q=la+valla+de+melilla&es_sm=91...