Blue Caves

Porthmos Zakinthou, Greece

The Blue Caves, in the island of Zakynthos which start around Agios Nikolaos and stretch to Skinari Cape, are a series of geological formations created naturally by erosion. The area, a hot spot for scuba diving aficionados, features a succession of limestone arches through which small boats can travel. It’s even possible to visit some of the caves, including the biggest one, Kianon (from cyan), where you can admire stalactites hanging like chandeliers from the top of the cave.

But what is most spectacular about these natural wonders is the unique colour of the water found inside. Indeed, as light reflects onto the water, it gives an eerie and ethereal blue colour to anything that touches it, including you.
Source : theculturetrip 
https://www.youtube.com/watch?v=QVBPhshMIm8
https://www.youtube.com/watch?v=MB_-xB3R4SI
Reviews
https://bit.ly/2Y1GFDC