Water Tower of the former Catalana de Gas Factory

This striking 45-metre-high Modernista water tower in Parc de la Barceloneta is a genuine piece of industrial history — it once supplied the water pressure needed to produce gas for the old Catalana de Gas factory. The circular tank perched at the top gives it an almost surreal silhouette against the Barcelona skyline. It's a rare slice of 19th-century engineering tucked right alongside the beach, and most people walk straight past it without a second glance — worth stopping for.