Some countries that have erected barriers are:
The country built a wall along the Turkish border, which was completed in August 2015. It marks the beginning of the walling off of Europe, as some are referring to it.
Hungary completed its wall along the Serbian border on 14 September 2015, and the wall along the Croatian border a month later.
Slovenia built a razor sharp fence, cutting across the Croatian border in November last year.
At the end of November, Macedonia completed a wall along the Greek border topped with barb wire.
In April of this year, Austria began construction of a ‘fence’ along the Italian border.
Now France joins them, funded by the UK.
These maps are from 2015: