Petzoldův lom, Limestone quarry in Srbsko, Czech Republic.

Petzoldův lom is a limestone quarry on the left bank of the Berounka River between Srbsko and Karlstejn, displaying exposed Devonian rock layers and industrial structures. The excavated walls reveal multiple mineral bands and several preserved buildings, including a reflector tower used to light night operations.

C.T. Petzold and Company founded the quarry in 1916 to extract limestone for steelworks and sugar factories in the surrounding region. The operation later expanded into fertilizer production, shifting the focus of industrial activity.

The quarry is named after the Viennese firm C. T. Petzold a spol., which bought the limestone slopes between Srbsko and Karlštejn and opened the site in 1916. Its limestone went to the Komárov ironworks, and from 1930 the works also made the plaster mix "Silurit". The site is now closed to the public and used by a private company, Aquatech s.r.o., which carries the quarry's reflector lighting tower in its logo.

The quarry area is private, used by the company Aquatech s.r.o., and not open to the public. Remains connected with the former quarry can be seen on the opposite bank of the Berounka, by the railway line: remnants of a cableway, a hopper and loading ramp, and foundations of limestone mills. The quarry lies on the left bank between Srbsko and Karlštejn, roughly halfway.

The quarry's lighting tower, powered by seven ČKD electric motors after full electrification in 1925, still appears schematically in the logo of Aquatech s.r.o., the wastewater-treatment firm now based in the former quarry grounds.