Incredible Facts About Intramuros: A Glimpse into the Philippines' Historic Walled City Intramuros is home to a secret underground tunnel network. The tunnels were built by the Spanish during the colonial period for defense purposes. Today, the tunnels are open to tourists and offer a glimpse into the city's past. Intramuros is also home to a number of haunted places. One of the most famous haunted places is the San Agustin Church, where it is said that the ghost of a Spanish friar still roams t