Quinta da Regaleira is the strangest place in Portugal: an esoteric garden of grottoes, towers and a nine-storey spiral well, built in Sintra between 1904 and 1910 for António Augusto Carvalho Monteiro, a Brazilian-born businessman known locally as Monteiro dos Milhões, who hired the Italian architect and opera set designer Luigi Manini. Together they turned a four-hectare estate into a programme encoding Templar, Masonic, Rosicrucian and alchemical symbolism into buildings, grottoes and planting. The Neo-Manueline palace with its octagonal tower anchors the site, a chapel with a Templar cross set into its floor stands beside it, and the garden climbs behind them through tunnels, fountains, terraces and turrets. The centrepiece is the Initiation Well, a 27-metre inverted tower with nine landings on a spiral stair, descended rather than climbed and connected by tunnel to the Waterfall Lake. Visitors wander the standard route past the palace, the chapel and the Terrace of the Celestial Worlds, then up through the grottoes into the woodland where the wells sit. UNESCO includes it in the Cultural Landscape of Sintra.