This is a traveller's sketchbook from a D&D campaign I'm currently playing. These shrines and monoliths have been discovered by the characters in a dense jungle. The odd rooflines on the shrines in Vorn and Genesaur have been constructed to accommodate the irregular shape of the stone monoliths within.
The original sketches are oil paint on paper, imported into Photoshop and laid out in this weathered journal.