The church was built by the Jesuits during the 16th century, but a fire resulting from a typhoon destroyed the building in 1835. All that stands since then through today is its facade.
In 2005, it was listed on the UNESCO World Heritage Site.
Here is a link to a drawing of how the area looked in 1854 after the church was already destroyed.
The stairs and balcony are modern additions to the wall for visitors look out of the openings. I am glad they are not noticeable from the front to hinder its beauty.
I think there is even a sign that says leaving or throwing objects is prohibited.
By the way, the stairway leading to the balcony and the balcony itself are made of metal grates. This means you can see directly below you through the gaps which can be a little scary at first.
There is someone taking her graduation picture with her mom on the left, a "panda" promoting his restaurant on the right, and a tour group on the stairs taking their group photo.