You’ll find the Regaleira Tower tucked above Leda’s Grotto, near the back gardens of Quinta da Regaleira. It sits quietly near the Terrace of the Celestial Worlds—because of course it does, everything here sounds like the title of a mystical poem.
To get there, wander through tunnels or climb from the greenhouse side. It’s not always clearly marked, which only adds to its secret-garden vibe.