Smaller Dungeons worth 4 HT total (2 for the Miniboss, 2 for the Dungeon).
The Zonai Ruin located along the coast near Hateno has a Dark Talus sleeping in it.
The Deku Palace is located in the Southern Swamps, and is home to all the Deku Scrubs. Only Deku can enter the palace.
The Pirate's Training Grounds are located on the coast of Faron and are for training Gerudo into Yiga affiliated Darknuts. They are in a nook between two cliff faces.
Ancient abandoned Goron mines. Their walls depict Subrosians and a dragon being chased through a mirror into a hellish world.
The place where Shinzo began his magical experiments. The Witch's Broom is found here with the feat "Broomcraft".
The mysterious woods is the dark part of the northern forest. It has within it a mirror to Termina that transforms those who get close to it.