- Malta Blue Grotto
The Blue Grotto (Maltese: Taht il-Hnejja) is a number of sea caverns in the village of Qrendi. Every day from sunrise until about 1 pm a unique sight can be observed here. The location of the cave combined with the sunlight lead to the water mirroring showing numerous shades of blue. Several caverns mirror the brilliant phosphorescent colours of the underwater flora; other caverns show a deep dark shade of blue. Booking.com