Sangshekanan Cave

Sangtarashan cave (‌, also known as Sangshekanan cave and Sangeshkan cave) is a man-made cave located in Jahrom, southern Iran. With several corridors, columns and openings, Sangtarashan is the largest hand-made cave in the world. The cave dates back to 150 years ago and is regarded as the largest artificial cave in the world. The cave lies to the south of Jahrom. Although commonly referred to as a "cave," it is actually an artificial excavation, meaning it does not meet the geological criteria of a natural cave.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).