The Mexican government placed a piece of the Berlin Wall just a stone’s throw from the U.S.-Mexico border in Tijuana, sending a clear message to border-security advocates in the U.S.

Tijuana Mayor Montserrat Caballero and former Mexican foreign secretary Marcelo Ebrard installed the shard of the Soviet wall during a ceremony last month. A plaque near its base, written by Caballero, reads, “May this be a lesson to build a society that knocks down walls and builds bridges.”

The message-laden move comes as the U.S. continues to expand its barriers across the nearly 2,000 miles of territory dividing the U.S. and Mexico. Unlike the U.S. border, however, the Berlin Wall was originally installed by an occupying power to divide a nation against itself.