Many spend a lifetime dreaming of visiting the 15th-century Lost City of the Incas, but the heartthrob singers managed a visit to the famous site after playing a concert during the South American leg of their Where We Are Tour in Lima, Peru's capital.
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Liam, 20, made the most of his time at the popular tourist destination, posing for photos with fans and taking a selfie with the legendary citadel perched among peaks providing a magnificent backdrop.
He also tweeted a picture of another selfie he took with mixed martial arts trainer Mark Jarvis, who is working with the group on their fitness regime throughout their tour.
Standing 2,430 metres above sea-level in the middle of a tropical mountain forest, Machu Picchu's extraordinarily beautiful setting is sure to be more impressive than the average backdrop of the boys' selfies.
Until 1911 the ruins of Machu Picchu were a secret lost to the world at large. Nobody would have imagined that among the inaccessible ravines of the Cordillera de los Andes mountain range lay hidden one of the largest and most valuable archaeological treasures of the world.
One hundred and thirty kilometres from Cuzco, the mystical Lost City of the Incas is no longer a secret, and now the world-famous 600-year-old ruins receive hundreds of thousands of visitors every year.
Having enjoyed one of the new seven wonders of the world first hand, Harry, Liam and the rest of One Direction are set for more gigs in Chile, Argentina, Uruguay and Brazil before continuing the tour in Europe.