At the northernmost point of Israel and at the border with Lebanon, there is a tourist attraction known as the "pigeon hole". In fact, it is an underground cave on the Mediterranean Sea. The scenery is strange. The cave is surrounded by white boulder cliffs. A cave has a cave and a winding path. The pool in the cave is connected to the outer sea. Under the illumination of the light, a variety of different fascinating blues are formed. As the sapphire is very moving, it is also called blue. hole. Of course, in addition to this naturally occurring geological wonder, the two feuding countries of Israel and Lebanon, and the border areas that have not yet reached a ceasefire agreement, also attract tourists to explore.