Arch vs Khorramabad

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An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof.

Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures.

Source: Wikipedia

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Khorramabad pronunciation (Persian: خرم‌آباد‎ or KhorMoa as local say - also Romanized as Khorramābād, Khoramabad, Khurramabad, Khorram Abad and occasionally Khur Ramābād) is a city and the capital of Lorestan Province, Iran. At the time of the 2006 census, its population was 328,544, in 75,945 families. Khorramabad is situated on the Zagros Mountains. Khorramabad Airport is 3 km south of the city proper. The city population is predominantly Lur and Lak, although the two groups are closely related.

Although not a major tourist destination, it is quite scenic and possesses several attractions, such as five Paleolithic cave-dwelling sites. In the city center, a tall citadel called Falak-ol-Aflak (The Heaven of Heavens), a relic of the Sassanid era, is now a nationally popular museum. Economically, it is the regional base of the agricultural industry.

Source: Wikipedia