In which year lsquo Valley of Flowers rsquo was declared a UNESCO World Heritage Site ........

Explanation:

=> It is located in Uttarakhand.

=> Declared a National Park in 1982, the Valley of Flowers stretches over an expanse of 87.50 sq. km.

=> It was declared a UNESCO World Heritage Site in 2005.

=> The valley was an accidental discovery by an avid British mountaineer and a botanist, Frank S Smythe, when he was traversing through the region in 1931.