piotr gontarczyk: it's not all right to deny walesa's leading role back then.nd to pretend he worked for the secret service and the communists all his life. there's no evidence for this. as the leader of solidarity, he was independent. reporter: jerzy borowczak approaches walesa's old electrical workshop. borowczak has vowed to fight for walesa's honour, and for the honor of those who fought along with solidarity. borowczak is certain walesa will be remembered as a liberator, and for nothing else. ♪ damien: finally to our special series looking at the different walls that divide or bring together the people of europe. and this week we're off to istanbul in turkey. which for thousands of years has had ancient defensive stone walls. built first by the romans to protect the imperial capital constantinople, as it was then known. and later also maintained by the ottomans when they took over the city in the middle ages. today large sections of the walls are not only still standing, but are even still in use. reporter: for more than a thousand years, the walls of cons