This curious cylindrical building near the marina is half sculpture, half observatory. The Swansea Astronomical Society uses the rooftop telescope for occasional public open evenings, when you can climb the spiral stair and look at the moon, planets and bright deep-sky objects over the bay.
By day, the tower is a striking landmark on the maritime promenade — a piece of public art that doubles as a piece of working science. Check the society's website for upcoming open nights.