The Lake Temple is a circular island building in the lake to the west of Gibraltar. The outer wall has decorative recesses and the internal circle of columns surrounds a well-like central core.

There is evidence that the columns may have originally been partially roofed so as to direct rainwater into the well itself. It is possible that the design was intended to emulate the plunge pool baths of Ancient Rome, such as the famous pool at Hadrian’s Villa in Tivoli.