Between Republican calls for a wall between the U.S. and Mexico, and the refugee crisis in Europe, border walls are in the news these days.

Here are new additions to The Best Sites To Learn About Walls That Separate Us:

First, here’s a BBC video explaining what’s happening in Europe, including some countries building walls on their borders:

Map: The walls Europe is building to keep people out is from The Washington Post.

Al Jazeera has a ton of videos about border walls.

WALLS, BARRIERS and FENCES is from Michelle Henry.