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Inaugurated in 2003, Chal Cave is the second longest cave in the world with a length of 8 km. Being an underground aqueduct, the cave attracts a lot of interest with its river and historic castle. It is known among the residents of Trabzon that cave is good for asthma and sinusitis. The cave, which welcomes many visitors throughout the year, has a walking area of 400 meters and includes a stream, waterfall and pool.