The majestic Billionth Barrel Monument was constructed in 1991 and possesses its own significance, which is to commemorate the one-billionth barrel of crude oil production from the prolific Seria-1 field well. The monument was built close to Seria-1, which was the first commercially viable oil well to be drilled, in 1929. In fact, the whole country has not looked back since the drilling of Seria-1