Let's get to the answer before these bells rattle your brains. The Spanish city we were looking for is Valencia.

Valencia West View with the Central Market: photo credit: http://flickr.com/photos/puroticorico/

The city just participated in a national census - not of people, but of church bells. Those bells can make a magnificent sound.

But all too often, modern bell-ringers are not people. They're machines. One man is trying to revive Spain's old bell traditions.

Entire Cross-style Valencia Cathedral Roof View of: photo credit: http://flickr.com/photos/puroticorico/

From Valencia, The World's Gerry Hadden introduces us to a man with a mission.

Listen to the interview