Have you ever stopped to think terrifying which may become the facade of one of the buildings most recognized of the contemporary architecture? The disturbing waves of a Zaha Hadid museum in Glasgow, the omnipresent Torres Blancas de Sáenz de Oiza in Madrid or the almost extraterrestrial La Caixa Towers by Francisco Mitjans Miró and José Antonio Coderch in Barcelona may have made your imagination fly and, even, have starred in the setting of one of your nightmares. Symbolism and architectural quality aside (that all these buildings have it for different reasons), which of them would you say are more terrifying?