Intramuros

During the Spanish colonial period, the walled city of Intramuros was considered Manila itself. Walking through Intramuros a timeless journey through forts and dungeons, old churches, colonial houses, and horse-drawn carriages.

Wikipedia: Intramuros, Manila
Intramuros, located along the southern bank of the Pasig River, was built by the Spaniards in the 16th century and is the oldest district of the city of Manila, the capital of the Philippines.
Intramuros: A History
Fortifying the noble and ever loyal city of Manila “Insigne y leal ciudad de Manila.”
The Walled City
The construction of Intramuros started in 1571 by Miguel Lopez de Legaspi, a Spaniard. The walled city covers an area of about 160 acres. Intramuros was a fortress city with walls 6 metres high and a commanding 3 kilometres in length, it is no wonder it was impenetrable.
Walking Tour of Intramuros
Touring Intramuros is an exercise in imagination. A bit of nostalgia and romance helps because, despite efforts to restore Intramuros, the old city is a mere skeleton of its once opulent self. Intramuros remained very much intact until February 1945 when in the space of about two weeks, 300 years of history were obliterated by fires and bombs, triggered by retreating Japanese troops, and fierce bombardment and mortar fire by Americans.
Fortification and Military Structures
Fort Santiago, Bastion de San Diego, Puerta Real, Capilia Militar, Plaza Militar.

Manila Cathedral /Basilica of the Immaculate Conception (Plaza Roma, Intramuros, Manila)
The Manila Cathedral, the sixth structure to rise on its site, was built from 1953 to 1958 and elevated to the rank of Basilica Minore by Pope John Paul II in 1981 and officially named Basilica of the Immaculate Conception.
Royal Monastery of Santa Clara (Intramuros, Manila, then Quezon City)
The Royal Monastery of Santa Clara was originally established in Intramuros, Manila by Sor Geronima de la Asunción, a relative of the Spanish monarchs. The Monasterio de Santa Clara transferred to Aurora Blvd. in Quezon City, overlooking the Marikina Valley.