One of the most spectacular cave at 120km south of Zanjan city is katale khor cave. According to some studies, Katale Khor is linked to Ali-Sadr Cave in Hamedan Province, at distance of 105km.
If you are intending to have an overnight stay there are suites and accommodations around this most beautiful cave in Iran with satisfactory access road.
The cave contains lime stalactites and stalagmites and huge halls and corridors, mainly dry. According to geologists of Iran, France, Italy, Switzerland and 16 other nations, Katale Khor has been designated as a top cave worldwide in terms of expanse and beauty. It pertains to the third geological era and dates back to 30 million years. The cave has seven floors (levels) in structure. The third floor has water routes. Some researchers presume that it is linked to Ali Sadr Cave in Hamedan Province.
From 30km of cave has been identified since now and tourists can visit 2850 meters of the cave in the first floor while visitor are asked to stop touching the stalactites and stalagmites to avoid and devastating.