Seto (White) Bhairab’s horrible face is hidden away behind a grille in an earthquake-damaged pavilion opposite King Pratap Malla’s Column. The huge mask dates from 1794, during the reign of Rana Bahadur Shah, the third Shah-dynasty king. Each September during the Indra Jatra festival the gates are opened to reveal the mask for a few days. At other times of the year you can peek through the lattice to see the mask, which is used as the symbol of Nepal Airlines.
During Indra Jatra, Bhairab's face is covered in flowers and rice; at the start of the festivities beer is poured through the horrific mouth as crowds of men fight to get a drink of the blessed brew.