Why no burying dead people in Rome?

In ancient Rome, burial within the city limits was prohibited due to concerns about public health and sanitation, as well as the desire to maintain the city's sacredness. Instead, the dead were typically interred in cemeteries located outside the city walls, such as along the Appian Way. This practice also allowed for the development of elaborate tombs and funerary monuments in designated areas. Over time, these sites became important cultural and historical landmarks.