With just over 600 inhabitants, this charming village is defined by a skyline shaped in the medieval period, descending from the dominant castle to the main church and then to the residential core.

Records of the Sacchi Nemours Castle date back to 1041, while 1298 marks the year when the Barlofa di Namur family came to power, a dynasty that would last for twenty generations.

At the beginning of the 18th century, the castle lost its purely defensive function and was transformed into a refined noble residence. Today, following an excellent conservation restoration that has brought the manor back to pristine condition both inside and out, it still serves as a private residence while also hosting significant hospitality activities. Its towers, loggia, courtyard with chapel, centuries-old trees, and massive walls built from alternating layers of stone and brick make it one of the most captivating castles in the entire area.

Frassinello also boasts another castle, probably one of the oldest in Monferrato: Lignano Castle. Built in the 9th century on the ruins of an ancient Roman house as a defensive castrum, it has been rebuilt several times. Today, it retains its original features and functions as a private residence and modern agricultural estate.

The village is also enriched by numerous churches. The parish church of Maria Vergine Assunta, located in the village center, probably dates back to the mid-15th century. Other notable churches include Sant’Anna, built in the 16th century and reconstructed in 1670; the Sanctuary of Madonna delle Grazie; San Giuseppe; San Pietro Apostolo (located within Lignano Castle); and the hexagonal chapel of San Bernardo along the road leading into the Ghenza Valley. Restored in 2018, San Bernardo stands as an exquisite example of Baroque architecture.