Every year, towards the end of September, the Spanish town of Barcelona hosts its largest street party – the "La Merce" Festival. One of the highlights of the event is the building of impressive human towers, by acrobats known as "castellers".
Translated as "castle builders", castellers are the people that take part in the building of the human towers, in the middle of Placa de Jaume. Surrounded by thousands of people who come to see them at work, the teams of castellers create impressive tower formations, several meters high. As you might imagine, this kind of exercise requires quite a deal of practice and planning, but if successful, their human structure is truly a sight to behold.
On November 16, 2010, castells were declared by UNESCO to be amongst the Masterpieces of the Oral and Intangible Heritage of Humanity.
