Osborne, Mary Pope. (2006). Pompeii: Lost and Found. New York: Scholastic.

This nonfiction book tells the story of the buried town from the volcano eruption of Mount Vesuvius. The books tells about the daily life in the city of Pompeii before the eruption. It then goes through the dramatic eruption of the volcano. Finally, the book talks about the finding of the buried town about 1,000 years later. The unique illustrations within this nonfiction book give good visuals for students to experience the ancient frescoes found years later in Pompeii.
This book would be great for a brief history lesson on Pompeii because the story is very fascinating for students of all ages.
This could also be used for a science lesson to talk about volcanoes.
The following is a BBC video about Pompeii for older elementary students:

Book Cover