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A scientific observatory; to use it, you must request the key from the Foix Park Office.
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Castell de Castellet
Built on top of a hill next to a meander of the Foix River, at the Foix reservoir. Remarkable set of round and square towers with high defense walls. Result of the "restoration" carried out from 1928. It has medieval elements (11th and 12th centuries) with other Gothic and many invented parts. It also has Romanesque and Gothic windows and crowning battlements. It forms a fanciful set.
Observatori d’aus de Cal Bladet
Access via the Font d'Horta route.Free-use observatory. It has two levels, the lower one with spyglass.
Castell de Penyafort
It is a complex formed by the remains of the old fortified manor house of Penyafort (circular tower, wall panels), a convent and a church. It is believed to be the birthplace of Saint Ramon de Penyafort (1185-1275), Dominican and canonist, doctor of jurisprudence from Bologna and advisor to James I, canonized in 1601. This space, with different architectural stages, is the gateway to the Foix Natural Park.