Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Sanctuary of the Madonna di San Luca Bologna - The Sanctuary of the Madonna of San Luca is a basilica church in Bologna northern Italy sited atop a forested hill Colle or Monte della Guardia some 300 metres above the city plain just south-west of the historical centre of the city. While a road now leads up to the sanctuary it is also possible to reach it along a (3.5 km) monumental roofed arcade (Portico di San Luca) consisting of 666 arches which was built in 1674-1793. It was meant to protect the icon as it was paraded up the hill.
The answer is:
Building