reporter: lubov kovalyova hopes to learn some day where her vladislav now lies.n she'll have a place to take her grief. anchor: a very sad story. do get in touch if you have comments about that, or any of the stories on today's program. but now to our series "europe's squares," where we take you to some of the most interesting piazzas and plazas in europe. and today we're off to barcelona, in spain -- one of my all-time favourites cities -- and to the square in front of the sagrada familia cathedral. now, it's gaudi's most famous work -- which is why millions of tourists come every year. i have to say when i last visited it wasn't exactly a relaxing experience being squeezed in between the crowds. but for local residents it's even worse. they say the entire neighbourhood is being ruined. reporter: it's arcelona's number one tourist draw, la sagrada familia. antoni gaudi's still-uncompleted basilica, with its innovative design and construction, has a way of amazing and enchanting nearly every visitor. japanese tourist: it's amazing. i don't know how to describe it