Blue cave is an absolute must-see on your ultimate summer what-to-do list on vacation in Croatia. Situated on the eastern side of the small island of Bisevo, this cave was a mystery to the public until the late 19th century, when the external entrance was breached. The only way to get into the cave is by a small rowing boat through a hole large enough to enter it but not to illuminate the cave. However, inside the cave, you are not in the dark. Light reaches through an underwater opening, reflected from the seabed, illuminating the cave with a beautiful blue color that is hard to forget. 

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