the bridge are in the form of six lateral lozenges made of limestone. The bridge was likely also used to distribute water. Materials of the bridge are river stones and stone chips in the arches and truncated stones in the piles. The bridge floor is paved in red block stones that have lost their square shape due to erosion. This attractive, huge bridge from Sassanid dynasty has been inscribed in the national heritage list under registration number 1058. Akhound Abu House Akhound Abu House is located in the historical texture of KhorramAbad city near to BabaTaher neighborhood and ShapurKhast castle. It belonged to Mirza Mohsen Gazi, who was chief justice of the city during late Qajar and early Pahlavi dynasties. The house is semi-introverted and is divided into winter and summer sections. The first one, which is used during winter, has two important rooms: Panjdari and Sedari. Panjdari is also called Shahneshin and was the most attractive room of the house. Muqarnas, Zigzag bricks (Khefteh-Rasteh), Golandaz are the main decoration of the house. The construction materials of the house are stone, brick, wood and mortar. Currently, museum of Lorestan's handicrafts is located inside the house. Tickets to visit this house are free. This monument has been inscribed on the national heritage list under registration number 2432. Keeyow lake Keeyow lake is a natural lake located in the Northwest of Khorramabad city. In 1975, It has been constructed by the order of Ali Mohammad Saki, the late mayor of KhorramAbad. This lake spans a seven-hectare area and has a depth of 3 to 7 meters. It is the only natural lake in Iran that is located inside a city. The lake is an appropriate place for aquatic animals and native and migratory birds. The amusement park as well as other recreational facilities next to the lake enhances its aesthetic and geotouristic values. The main spring of the lake is located in the northern part of the lake and is supplied by aquifers from nearby mountains. Since the spring is a seasonal one, during winter the water is supplied from another permanent spring located under ShapurKhast castle, Golestan spring. During holidays, many tourists and locals spend their leisure time in the amusement park or use other facilities inside a park located near to the lake, Keeyow Park. It is the most important park of the city. Every morning, many locals come to