The bells of St Peter’s Basilica rang out in unison with thousands of other church bells around the world Sunday as Pope Francis commemorated the 100 year anniversary of the end of World War I.

“While we pray for all the victims of that terrible tragedy, let us say forcefully: invest in peace, not on war!” Pope Francis said at the end of his Angelus address on November 11.

The memory of World War I should be a warning to “reject a ‘culture of war’ and seek every legitimate means to put an end to the conflicts that still bleed several regions of the world,” he said and added, “It seems that we do not learn.”