Joanna Lumley retraces her grandad's steps in Bhutan.

Watch Joanna Lumley in the Kingdom of the Thunder Dragon

Bhutan, the beautiful land-locked nation in the Eastern Himalayas, has always been steeped in mystery.

In this revealing BBC travel documentary, Absolutely Fabulous star Joanna Lumley retraces the steps her grandparents took in the country 60 years before. Through her eyes, a world that challenges accepted ideas of wealth and happiness is explored.

But what family secrets will Joanna uncover?

Watch Joanna Lumley in the Kingdom of the Thunder Dragon and more acclaimed documentaries on BBC Select today. Restrictions apply*.

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