A Magical Cave in West of Iran: PARAU CAVE is a great place in IRAN

Iran is the home for more than 100 caves but the most extraordinary cave is called Parau (limestone cave) located in the Zagros Mountains, north of Kermanshah in Western Iran. 
Parau, (751 meters deep vertically) , (3000 m above sea level) is the deepest cave in Iran and one of the deepest caves in the world. 
It takes 3 days to explore the whole cave.

Ghar Parau is a limestone cave in the Zagros Mountains, north of Kermanshah in Western Iran. At 751 m deep, it is the deepest cave in Iran. Joujar Cave has been reported as the second deepest, at 568 m deep.

Isfahan Historical bazaar

History
A British led caving expedition to the Zagros Mountains in 1971 led to the discovery of the cave.The cave was explored to a depth of 742 m by the time the expedition was forced to return to the surface.The explorers believed that the cave might go on much further, possibly surpassing the Gouffre de la Pierre-Saint-Martin system, which at that time was the world’s deepest known cave.

The team returned the following year and passed their previous limit, but to their great disappointment the cave sumped almost immediately at a depth of 751 m and could be explored no further. To be “Ghar Paraued” became a term used in British caving for a small, disappointing breakthrough following great effort to discover new passage

some the contents were taken from wikipedia.