Big Tree Panorama
Composed of about thirty photos (roughly 11 sets of bracketed exposures, with most bracketed sets having three photos each, separated by 2 EV, but a few having only two due to excessive motion blur in the brightest frames).
This is done in two phases in Lightroom - blending each HDR set first, and then panorama stitching the resulting DNG files. Tedious, but the only way to get Lightroom to do a HDR panorama.
Curiously, I tried several approaches with these same source photos in PTGui & PTGui Pro, and the results were significantly worse than Lightroom's. This is with the relatively new v11 of PTGui… I don't know if there's some regressions & problems with v11 vs v10, but v11 yielded a surprisingly high number of terrible panorama blending errors (duplicate people, people cut in half, silvered / ghosted people, etc). Usually PTGui delivers vastly superior results to Lightroom. Hmm.