at the concurs de castells in spain. this pits rivals against one another to see which ones can erect the biggest and tallest castells, or human castles. this woman is a chief communicator. >> because it's the only >> because it's the only official day that is a competition. at the end the winner receives a trophy. >> has won the last five in a row. a castell is only considered a success if it can be dismantled without collapsing and crushing those underneath.