A dashcam video caught a near miss with a huge boulder in the Taroko Gorge in Eastern Taiwan on April 18, 2019. The rockfall was triggered by a 6.1 magnitude earthquake in the area, you can even hear the emergency alert sound on the radio in the video. More info can be found at the Landslide Blog.
The National Geodetic Data Center (NGDC) of NOAA has an online collection of photos of various geologic hazards. Many of the photos are from older sets of 35mm slides that have been digitized. They are free to use provided you credit the photographer and the NGDC as the source. The would be really useful for educators and for powerpoint presentations. The only drawback is that they are in TIF format and some of them could use some retouching. (Photo by University of Colorado, made available by NOAA/NGDC)