The most remarkable feature of Almansa is its impressive castle, built on top of a great rock that crowns the city. Of Arab origin, this castle was rebuilt by Don Juan Manuel in the 14th century.

The historic quarter, which was declared a Historic-Artistic Site, is formed by narrow streets that surround the castle. Inside we must point out the Palace of the Counts of Cirat, also known as "Casa Grande" (Big House), with a beautiful Mannerist main front. Civil architecture is also represented by 17th-century ancestral homes, such as the house of Enríquez de Navarra, and the one of the Marquis of Montortal; the old communal granary, which today houses the local Arts Centre, and the City Hall. When it comes to religious buildings, we must mention the parish of Asunción, from the 16th-19th centuries; the convent of the Augustinians, with a Baroque façade; the convent of San Francisco, and the hermitage of San Blas.