Relojes Centenario (or Centenario Clocks) is the first manufacturer of monumental clocks in Latin America. It was founded by Alberto Olvera Hernández in the municipality of Zacatlán, Puebla, Mexico as a workshop on the family farm when he was a teenager. His first clock was for the family farm but the next one went to the main church in Chignahuapan, which still functions to this day. The name Centenario was adopted in 1921 to mark the centennial of the end of the Mexican War of Independence. To date, the company has built over 2,000 monumental clocks for churches, government buildings and more as well as repaired Mexican and European built clocks. There are Centenario clocks in most part of Mexico and the company sells abroad as well. In 1993, the company opened a Clock Museum in the upper level of the factory, with both the museum and factory open to the public free of charge.