Nakhcheer or Chal-Nakhjir is a cave situated in Markazi Province of Iran. It is a limestone cave approximately 70 million years old. It was discovered in 1989 and registered as a national monument in 2001. Its interior is made of crystals, dolomite sediments,stalactites and stalagmites.
More fascinating pictures: Payvand News of Iran | Photos: Nakhcheer cave