There’s a tradition in Spain’s Catalonia region that is equal parts impressive and weird. And I'd like to see it in person some day. It's called a castell. A castell is a sort of elaborate human pyramid. Maybe you’ve seen one. If not, here’s one in action.
In a nutshell, a castell is a bunch of people in traditional clothing assembling themselves into a giant tower. They can reach up to 10 levels, towering over 50 feet high. A castell is only complete when the last person arrives at the top and raises a hand with four fingers extended (as a symbol of the four stripes of the Catalan flag). At that point he (or she) climbs down the other side, and the whole tower dismantles itself.
The tradition started in the 18th century down near the city of Tarragona in southern Catalonia. Today castells are most commonly “constructed” at festivals all over Catalonia (of which Barcelona is the capital), where competing castellers try to outdo their human-climbing opponents.
Traditional castellers wear special uniforms and use customary lingo as they perform their very specialized activity. Their motto is "Strength, balance, courage and reason.” All good things, if you ask me.