Incredible time-lapse footage shows clouds engulfing onlookers as they roll in from the sky over a mountain top. The impressive force of nature was captured in sped-up footage at the Phu Thap Boek mountain. Phu Thap Boek, also known as Phu Man Khao, is a 1,768 m high mountain in the Lom Kao District, Thailand, that has become popular with travellers for its closeness to the clouds.