Ogrodzieniec Castle, Medieval castle ruins in Podzamcze, Poland

Ogrodzieniec Castle is a fortress ruin in Podzamcze, Poland, that stands on Castle Mountain at 515 meters (1,690 feet) above sea level and incorporates natural limestone formations into its defensive structure. The complex spreads across multiple levels with courtyards, walkways and tower remains that allow visitors to walk through different sections of the former stronghold.

The original wooden stronghold from the 12th century was destroyed in 1241 during the Mongol invasion, leading to construction of a stone fortress. The complex was expanded and modernized during the Renaissance before suffering heavy damage from Swedish troops in the 17th century and eventual abandonment.

The castle's name comes from the nearby town of Ogrodzieniec. In Podzamcze, on the market square beside the castle, stands a chapel built from castle elements such as a portal, volutes and a cornice. Inside are the castle chapel's vault keystone, a cannonball said to have fallen into the castle during the Swedish Deluge, and a Renaissance figure of the Virgin Mary repainted by locals in folk style.

The ruins stand on Castle Mountain, the highest hill of the Kraków-Częstochowa Upland at 515.5 m, and are reached on foot from Podzamcze. The site is part of the Trail of the Eagles' Nests hiking route. Conservation carried out from 1949 to 1973 fixed the walls as a permanent ruin, so surfaces and levels remain uneven.

Three tall limestone rock formations rise from the fortress grounds and form natural foundations as well as defensive elements of the fortification. The stronghold served as a filming location for several fantasy films and television productions, which brought it recognition among international visitors.