I looked all over for a date and got everything from “early 1800s” to “late 1800s” but nothing exact, so I had to make an educated guess. The first cameras practical enough to take such a photo were developed around 1840 and the excavations began in 1867.
They are still discovering ancient ruins all the time. In fact, Lidar makes it easier.
https://www.bbc.com/travel/article/20230704-ocomtn-a-long-lost-maya-city-that-was-just-discovered