This slab of the Berlin wall was donated by Berlin/Germany in 2015 to the 30th anniversary commemoration of the Gorbatchev-Reagan presidential (and historical) meeting, which took place nearby in the Höfði house in October 1986.
How to Find Piece of the Berlin wall in Reykjavik:
The Berlin wall slab is placed right next to the 22-22 Borgartún street, quite close to the Höfði house.
GPS coordinates of the Piece of the Berlin wall in Reykjavik: 64.145714, -21.904706 Take me there!
Photos of the Piece of the Berlin wall in Reykjavik:
The Nearest Interesting sights by the way