Kariz means aqueduct in Farsi, and the art of carving aqueducts dates back to 6000 years ago. This ancient tradition has evolved from a survival necessity into an architectural marvel. Located 16 meters underground, its ceilings, filled with fossils, shells, and corals dating back 270 to 570 million years, make Kariz unique. It is the only structure with a natural coral and shell ceiling, located on the world’s only coral island. The Kariz-e Kish complex was on the verge of destruction until Engineer Haji Hosseini, residing in Germany, took it upon himself to rejuvenate this historical site. His efforts have transformed it into a much-visited tourist destination, now featuring a traditional restaurant, a small bazaar, and a museum at the ground level.