Lom Alkazar, Limestone quarry in Hostim, Czech Republic.

Lom Alkazar is an abandoned wall-type limestone quarry cut into the slope of the Kozel hill above the left bank of the Berounka, north of Srbsko. Its face is broken into two half-arches and worked in horizontal benches, the lowest of which now holds the climbing park. The regular quarry terraces remain clearly visible beneath the regrown vegetation.

The Česká montánní společnost opened the Hostim I quarry between 1907 and 1909 to supply limestone to its kilns at the Karlo-Emilov works. In 1909 the company merged with the Pražská železářská společnost, which ran the quarry until nationalisation in 1945. Mining stopped during the Second World War, and in 1944 the Škodovy závody began driving tunnels for an unfinished underground munitions factory codenamed Kainit.

The name Alkazar was given by trampers, who found the quarry walls reminiscent of the high-walled Moorish fortresses of Spain; the nickname entered official maps around 2000. The overgrown terraces now draw film crews: the 1964 western Zlatokopové z Arkansasu with Olga Schoberová and a scene from Hynek Bočan's 1983 comedy Svatební cesta do Jiljí were shot here.

The quarry is reached from Beroun on an asphalt lane along the left bank of the Berounka (cycle route EV4), continuing past the quarry to the Na Kozle settlement. On foot or by bike only, not by car. From Na Kozle an unpaved path along the cliffs leads to Srbsko, passing the Barrandov Cave, which is not open to the public.

Between 1959 and 1964, radioactive material from the Research Institute at Řež was stored in part of the quarry's underground spaces, making it one of the oldest radioactive waste repositories in the Czech Republic. The chambers were sealed with massive concrete barriers and secured against entry only in 1997.