EntityQ1140634· pop 25· linked from 53 articlesAlcalá GateSign in to savecultural property in Madrid Distritos: Retiro y Salamanca, SpainConnectionsSpainCountryMadridEntityMiddle AgesEntitygeographic coordinate systemEntityKaty PerryPersonLinkin ParkEntitygraniteEntityInternational Standard Serial NumberEntityAlcalá de HenaresEntitySegoviaEntitylimestoneEntity30 Seconds to MarsEntityNeoclassicismEntityCharles III of SpainEntityPrime Minister of SpainEntityNeoclassical architectureEntityColmenar de OrejaEntityAnahíEntityLonginusEntityart movementEntityCategories1778 establishments in SpainBien de Interés Cultural landmarks in MadridBuildings and structures completed in 1778Buildings and structures in Retiro District, MadridCalle de AlcaláCharles III of SpainCity gates in SpainMonumental gates in MadridMonuments and memorials in MadridNeoclassical architecture in Madrid