Video report by ITV News Correspondent Geraint Vincent
The Duke and Duchess of Cambridge have begun the sixth day of the royal tour with a hike up to Bhutan's famous Tiger's Nest monastery.
They posed for photographs before setting off hand in hand for the six-hour round trip through a pine forest on the slopes of the hill.
Dressed casually in trousers, shirts and walking boots, the pair stopped to chat to a small group of American tourists who were on their way back from the landmark sacred site.
Lauren McKennan, 29, from San Francisco, said the pair spoke to them for "three to five minutes" and described them as being "pretty altogether"
"There wasn't a single trail of sweat," McKennan said. "They were absolutely charming."
However, a little later in the journey the Duke looked slightly more flushed than his wife and wiped the sweat from his brow.
He laughed and said "So far so good", and, looking around at the view, added: "This is absolutely stunning."
The Taktsang Palphug Monastery, commonly known as the Tiger’s Nest, is 10,000ft above sea level and it is expected to take the couple three hours to climb there and back.
William and Kate, guided by the director of the national museum, Phuntesho Tashi, spun a series of Buddhist prayer wheels in the picturesque spot, which followers believe absolves sins.