1. The 19th and 20th century saw more systematic excavation of Pompeii led by figures like Fiorelli who introduced techniques like body casts and numbering systems. 2. New technologies in the late 20th century allowed for advances like mapping sites more accurately and using imaging to read undiscovered scrolls. 3. There are ongoing efforts to preserve the sites through documentation and protecting artifacts and buildings from damage, but challenges remain around tourism, funding conservation, and handling human remains.