Inset (noun)

1. A smaller map, picture, or piece of information inserted into a larger one.
2. A recessed panel in a door or piece of furniture.

Origin:

Mid 17th century: from in-1 "in" + set.

Examples:

1. The atlas had a detailed inset of the city center.
2. The cabinet door had an inset of carved wood.
3. The textbook had an inset of a historical timeline.
4. The inset provided important information about the location.
5. The inset added a decorative touch to the furniture piece.