St. Peter’s Basilica, located in Vatican City, was completed in 1626, so it is nearly 400 years old. Its construction began in 1506 under Pope Julius II, taking over 120 years to complete. However, it was built on the site of an older basilica dating back to the 4th century, commissioned by Emperor Constantine in around 319 AD.
So, in total, a place of worship has stood on this site for over 1,700 years!