The company's largest engine plant in the world has been building powerplants since 1985.

Honda's Anna, Ohio, engine plant has celebrated a significant milestone, building its 25 millionth engine.

The factory represents the Japanese automaker's largest engine plant in the world, first opening in 1985 with just 94 workers. Output now averages nearly 1.2 million units annually.

The factory builds four- and six-cylinder engines distributed to assembly plants in Ohio and Indiana. Some are exported to global sites including Ontario, Canada and the Civic Type R's home factory in the UK.

Honda recently outlined a $47 million retooling investment to support the 2018 Accord, including a new direct-injected VTEC Turbo four-cylinder engine and the 2.0-liter i-VTEC Atkinson Cycle engine for the Accord Hybrid.

The company suggests its current output rate will require just 21 more years to build another 25 million engines.