Chilean trav­eller Anto­nio Oliv­era cre­at­ed this incred­i­ble sea­side struc­ture back in 1914 in his adopt­ed home­town of Mazatlán. The pool, with its dis­tinc­tive spi­ral slide, was restored in 2015. Now it’s a dreamy place to watch the sun­set over the Pacif­ic.