National Park Mystery Spot 31 is a building located in a National Park System unit. Can you identify the building from these clues?
You can walk through this building without opening a door.
You can open a door, walk into this building, and then walk into a tree.
You can leave this building and walk into a forest.
You can walk through this forest, see trees with knees, and never touch the ground.
Check back with Traveler tomorrow for the answer and an explanation of the clues.