This is modern town. The most interesting building to see is the royal palace built in 1752 by the Architect Vanvitelli for the king Carlo III who wished to have a sort of Versailles of the south. An other location of interest is the medieval town of Caserta vecchia, that rise on a hill a few kilometres from the new town. If you have time there is also a third location to visit which is San Leucio. It was the "utopia" of Ferdinando IV di Borbone, who while in France was the time of the French revolution wished to found an ideal community built around the silk factory, governed by rules that he himself wrote directly as a sort of communist society.
What to see
The Royal palace, the medieval site of Caserta vecchia, San Leucio.
How to get there
By car, take the highway A3 to Naples. Then go on towards Rome and exit at Caserta Nord. If you don’t like driving, get to Naples by a Circumvesuviana train and once in the the Naples train station, move upstairs to the Napoli Centrale train station and then get a train to Caserta.
40 Km. 
4 ore.