Baal worship. . .

Carthage
Most of Roman Carthage (which was the third largest Roman metropolis in the 200-400 era, after Rome and Alexandria - the population was around 300,000) is buried beneath the modern town of Carthage, but some that is accessible has been excavated.

After the Third Punic War in 146 BC, very little remained of the old Phoenician Carthage - except things like these boxes. The Phoenicians worshipped Baal, who required that everybody's first-born be sacrificed. The ashes of these kids were buried in these sad little stone boxes.