The rock glaciers of the Swiss National Park were the first in the world where in-situ measurements of surface displacement were undertaken, starting with the pioneering work of Chaix in 1918. This globally unique long-term record is a main reason why these rock glaciers have recently been ordained by UNESCO as one of the top 100 IUGS geological world heritage sites. With our work we have filled the gap previously existing between the measurements from the early 20th century and the most recent measurements made over the last two decades. Through the application of photogrammetric techniques, we use this unique record spanning more than a century to geomorphologically analyze the spatiotemporal evolution of rock glaciers in the region, and to disentangle the interplay with their contributing glaciers. We show that these rock glaciers are in different phases of degradation with a general trend of deceleration and loss of volume. We observe how changes in kinematics seem to be historically controlled by the hydrological contribution of their nearby glaciers, with which they have been in close contact since the end of the Little Ice Age, but which are now severely degraded.