Far in the northwest corner of Italy, in the town of Antey-Saint-André, an ancient, little-known aqueduct hugs the hillside. Dating back to the ninth century, the medieval aqueduct, known as Ru Du Pan Perdu, was originally built as an irrigation canal. The structure would collect water falling from mountainside streams and funnel it to the agricultural land below. The name Ru Du Pan Perdu literally means "channels of lost bread" and indicates that the laborers who built the aqueduct were likely never paid for their work and therefore did not complete the project.

The site became a popular spot on the European "Grand Tour." From the 17th to the mid-19th centuries, European wealthy young people would embark on these Grand Tours across Europe and the Middle East, often spending months or even years away. One such tourist, Edward Whymper, who climbed the Matterhorn in 1865, wrote about seeing the aqueduct in his diary: "One sees from the path, at several places on the right bank of the valley, groups of arches which have been built high against the faces of the cliffs."

At the time, almost everyone thought these impressive arches were Roman, not medieval. Guide books of the era repeated the falsehood. But Whymper correctly guessed the aqueduct was a later construction. He wrote, "the work has not the usual Roman solidity. The arches have always seemed to me to be the remains of an unfinished work."

Today, the aqueduct is visited far less frequently than in the 19th-century. But for those willing to make the trek, the structure also offers stunning views of the surrounding Alps.