Alqarah Cave ,  in Al-Ahsa province, Saudi Arabia  

Is one of the most amazing caves in the world warm in winter , cold in summer
  Strangely formation, and the advantage of the limestone and the many ramifications and entrances

Strangely formation, limestone with many entrances and ramifications

 I invite you to see some pictures of the cave
Click on the image to see larger size  and clearer

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