Rayen Castle is one of the greatest adobe buildings in the world. This great historical building with an area of twenty two thousand square meters is the second greatest adobe building in the world after Arg-e Bam that is annually the host of thousands of domestic and foreign tourists. Rayen Castel includes a school, a dock, barracks, quarantine building and a mosque or warehouse. Watchtowers had it under control from several directions such that this castle is considered an indomitable castle. Rayen Castle is located in the south west of the current Rayen City in Kerman Province. This adobe building is similar to Arg-e Bam to some extent and is up a hill.