do Conde with Porto and the airport, providing both normal and express services, in addition to northern connections to Póvoa de Varzim. The line also operated an older rail-line that connected Porto and Póvoa de Varzim, with intermediary stops in Vila do Conde, but was discontinued in 2002 in favour of Metro services. Situated from the centre of Vila do Conde, the Porto-Francisco de Sá Carneiro International Airport (OPO), the second largest international airport in the country is linked to Vila do Conde across the A28, EN13 and Porto Metro. Architecture Civic Aqueduct of Vila do Conde () - initially constructed between 1705 and 1714, it had 999 arches and ran for four kilometres; the aqueduct is the second longest in Portugal, connecting a spring in Terroso, Póvoa de Varzim, with a fountain in the monastery of Santa Clara. Municipal Hall of Vila do Conde () - located in the Praça Nova (or Praça Vasco da Gama) square, date back to 1543 (supposedly the date of completion), it is located in front of the municipal marker (), and is one of the more important urban interventions in Vila do Conde since the 16th century. The executive office block and the Salão Nobre (), in particular, are the centrepieces of the building, with an ornate portrait of Queen Maria II of Portugal surmounted by royal coat of arms. Mill of Azurara () - a rectangular building, with the coat of arms in sculpted rock of the Marquess of Vila Real (who in the 16th century ordered its construction). Military Fort of Saint John the Baptist () - the fort is located at the mouth of the Ave River. Religious Chapel of Our Lady of Help (), the chapel is implanted on a rocky escarpment over the Ave River, on the Rua do Socorro; the chapel is atypical of Portuguese architecture: it has a square plan and large rounded dome. Yet, in the interior, the chapel exemplifies 18th-century architecture, with azulejos showing the life of Christ, and a Rococo-style altar. It was ordered built by Gaspar Manuel, knight of the Order of Christ and chief-pilot in service to the King during voyages to India, China and Japan, and his wife Bárbara Ferreira de Almeida; both were buried there on their deaths. Chapel of Our Lady of Guidance (), the chapel dates back to the 10th–11th century; located at the end of Avenida