Portico di San Luca: Photo credit: Stefano Carnevali/Shutterstock.com
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Atop a forested hill, some 300 meters above the city of Bologna, stands the Sanctuary of the Madonna of San Luca, a 12th century Roman Catholic church. You can drive all the way up to the hill, but you can also walk through a specially constructed corridor. This covered monumental roofed arcade consists of 666 arches and stretches for 3.8 km making it the longest portico in the world.
Source: amusingplanet.com