Il-Maqluba is a 50-metre-deep, roughly oval sinkhole on the southern edge of Qrendi village, hidden behind the small Church of St Matthew. From the church's parapet you look straight down into a circular green pit, its sides choked with fig trees, carob, capers, and pomegranates. The microclimate at the bottom — cool, sheltered, and slightly damp — supports plants that struggle elsewhere on the dry Maltese plateau.
A short flight of steps takes you partway in for a closer look at the rock walls, though the floor itself is not really accessible. The site is free, almost always empty, and pairs naturally with a walk through the village to the parish church and on to Ħaġar Qim.