The 3D postcard shows a replica of the famous Maria Cristina Falls (as read in the postcard) at the Luneta Park, Manila. It doesn't look like the real falls though.
Maria Cristina Falls, at 320 feet high, is the second highest falls in the Philippines. It is found in Iligan City on the island of Mindanao. It is sometimes called the "twin falls" as the flow is separated by a rock at the brink of the waterfall. The waterfall is also the primary source of electric power for the city's industries.
Maria Cristina Falls Wikipedia Entry