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Prince Harry honors 'remarkable' grandmother Queen Elizabeth

In a new documentary honoring the monarch on her 90th birthday, Prince Harry praises his "remarkable" grandmother's leadership.
/ Source: TODAY

In a new documentary that pays tribute to Queen Elizabeth in honor of her upcoming 90th birthday, her grandson Prince Harry admits he struggles with the “huge expectation” he has felt growing up in the long-reigning monarch's shadow.

Chelsea Flower Show
LONDON, ENGLAND - MAY 18: Queen Elizabeth II and Prince Harry attend at the annual Chelsea Flower show at Royal Hospital Chelsea on May 18, 2015 in London, England. (Photo by Julian Simmonds - WPA Pool / Getty Images)WPA Pool / Getty Images

"There is nowhere on this planet that I can think of that she hasn't been in the last 90 years. She's been everywhere," the prince said in an interview taped before he headed to Nepal on an official royal visit. On Thursday Kensington Palace tweeted a photo of Harry after he spent the evening with a local family there:

"Sometimes its quite hard because you go to a place where she hasn't visited for maybe 20 years, maybe 15 years, and you just think to yourself, 'How can I ever fulfill this huge expectation that comes with her and being a member of her family?" Harry continued.

RELATED: Prince Harry explains the wonderful reason he's extending his Nepal trip

On Wednesday, Harry announced plans to extend his stay in Nepal to help rebuild a school there that was severely damaged in last year's devastating earthquake.

IMage of Queen Elizabeth with Prince Harry.
Queen Elizabeth and Prince Harry.WPA Pool / Getty Images

The upcoming documentary about the queen, who turns 90 on April 21, includes a clip that shows Elizabeth vowing on her 21st birthday in 1947 to dedicate her life to "service of our great imperial family."

Calling it a “hugely moving speech,” Harry speaks fondly of the moment. “It’s just incredible to know that someone at that age appreciated and understood exactly what was expected of them, and to basically put duty ahead of everything else so early on in her life is quite remarkable.”

The documentary, which airs Sunday in the United Kingdom, also includes interviews with Harry's sister-in-law. Kate, the Duchess of Cambridge, shares stories about her children's relationship with their great grandmother, whom they call "Gan-Gan."

Follow writer Eun Kyung Kim on Twitter.