Italy🇮🇹, Capri, Blue Grotto

🔶The Blue Grotto (Grotta Azzurra) is the main natural attraction of the popular Italian island of Capri, known since the Roman Empire. It is located in the northern part of the seaside resort, near the town of Anacapri, in the province of Naples.

🔶The grotto is a coastal cave of natural origin, partially submerged in the waters of the Tyrrhenian Sea. On sunny days, the water and the walls in the grotto appear in azure color, hence the name. It has only one entrance — from the sea, so you can only get to the grotto by boat. You can get into it through a small arch in the rock.

🔶The stone vault rises 15 m above the sea, while its length is approximately 56 m, and its width is 30 m.

🔶The amazing neon-blue color of the water inside the grotto is achieved by reflecting the sun's rays seeping through the underwater hole. Light passing through a water filter loses the red part of the spectrum, retaining only the blue.
https://earth.google.com/web/search/Grotta+Azzurra