Alcalá de Henares, a city in the Madrid region of Spain, is a treasure trove for urban explorers. Its historic center, a UNESCO World Heritage Site, boasts a rich collection of centuries-old buildings, streets, and squares that are waiting to be discovered. From abandoned churches to hidden courtyards, Alcalá de Henares offers an array of off-the-beaten-path locations that are sure to excite even the most seasoned urbex enthusiasts.