Falak-ol-Aflak

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Shapur Khast
دژ شاپورخواست
Location within Iran
General information
Type	fortress
Location	Khoramabad, Luristan,  Iran
Coordinates	33°29′01″N 48°21′12″E / 33.4837°N 48.3534°E / 33.4837; 48.3534
Estimated completion	Sasanian era (224–651)

Falak-ol-Aflak (Persian: فلک الافلاک, lit. 'the sky of the skies') or Shapur Khast Castle (Persian: دژ شاپورخواست) is a castle situated on the top of a large hill with the same name within the city of Khorramabad, the regional capital of Lorestan province, Iran. This gigantic structure was built during the Sassanid era (224–651).^[1]

The Khorramabad River runs past the eastern and south-western side of the Falak-ol-Aflak hill providing the fortress some natural protection on those sides. Today, the western and northern sides of the hill are bordered by the residential districts of Khorramabad.