The Viaduct is an immense stone bridge in Hogwarts, which spans a gaping chasm. There is a safety balustrade, also built of stone, on each side of the bridge, to prevent people falling. At night, torches are lit to provide lighting. The Viaduct connects the Viaduct Courtyard and Viaduct Entrance. The bridge has many arches, with smaller and more frequent ones on the upper part and longer, larger but fewer below it, maybe to act as support. In the Battle of Hogwarts, animated stone soldiers were placed on the Viaduct.
Algaea OlympianHufflepuff -3rd year Hufflepuff – 03:50, February 20, 2017 (UTC)
Even though she was allowed to go to Hogsmeade, Aglaea had still been trying to get out of school as any of her older siblings. She had recently tried to get out of school as Artemis and once again failed, so she just sat on a wall in the Viaduct, her normal self but big enough to fit in her older sister's clothes.
Clara DavidsonSlytherin Third Year -- – 14:55, February 20, 2017 (UTC)
She came along the Viaduct, just a short distance away from the other girl.
Algaea OlympianHufflepuff -3rd year Hufflepuff – 17:24, February 22, 2017 (UTC)
Aglaea didn't see the other girl, being that she was to distracted with changing her hair colour, going through every colour she knew.