Casa do Arco da Cadeia (House of the Chain Arch), Obidos

The House of the Chain Arch, a former prison in Óbidos, Portugal, is an unexpectedly charming structure. Once functioning as the Town Hall in the 14th and 15th centuries, it evolved over time to become the residence of painter and scenographer Abílio de Matos e Silva in the 20th century. Portions of his residence became the original site of the Municipal Museum, which has since been transformed into another museum, now named after Abílio.

Its gothic arch and windows make it an architectural gem visible from the terrace adjacent to Santa Maria Church. In 1958, Abílio acquired the Casa do Arco, inspired by his own artistic portrayal of "Óbidos Vila Antiga de Portugal" that featured two houses with arches in 1938.

Following restoration by Maria José Salavisa, his widow, the house was donated to the Óbidos City Council as a tribute to her husband. The space is open for visitation by appointment, serving as a tribute to both Abílio and Maria José.