- The castle that gives the name to the town Castrum ad Mare.
- Palazzo Farnese, the town hall seat and of the civic museum.
- Reggia di Quisisana, residence of Charles I of Anjou
- Scoglio di Roviglian, the fortress built in 1564 to defend town from the Saracen pirates.
- Arco di San Catello, an arch in an ancient town of XIV century and one of the symbols of the town
- Piazza Orologio, the beautiful square
- Piazza Fontana Grande, an important square in the heart of the town and near the port, situated at the feet of the hill on which the castle is.
- Antiquarium Stabiano or archaeological museum: it contains the findings from the excavations of the ancient Stabiae.
- Museo Diocesano, the diocesan museum which contains the findings from the excavations under the cathedral.
- the Cathedral: it was built on the former building destroyed by an earthquake and was completed in 1643
- Chiesa del Ges?, a church dedicated to Jesus Christ
- Chiesa dello Spirito Santo, a church dedicated to the Holy Spirit
- Santuario della Madonna della Libert?, a Sanctuary dedicated to Our Lady
- Basilica Madonna di Pozzano, a basilica dedicated to Our Lady
- Archaeological excavations
Castellammare di Stabia is one of the most populated towns of Campania and it is very famous thanks to the thermal baths and the archaeological excavations of Stabiae.
Thermal baths of Castellammare di Stabia include 28 different kinds of mineral water: sulphurous water, calcic water, etc.
The ancient town of Stabiae was an important thermal bath used by Roman noblemen and was buried by the eruption of the Vesuvius in 79 a. C..
The excavations of Stabiae are not as famous as those of Pompeii and Ercolano, but they are very interesting too, thanks to the finding of three elegant villas and thermal baths.
The castle the city takes its name from was erected in around the 9th century on a hill commanding the southern side of the Gulf of Naples. It was restored during the reign of Frederick II of Hohenstaufen and enlarged by King Charles I of Anjou.
Castellammare was the hometown of Gabriele Capone, father of Al Capone.
This town has several interesting monume and attractions: