Treehouse

A Treehouse is a house built on a normal tree or inside a Living Tree. Building iside a Living Tree is pretty "safe" because it protects you and the NPC's from monsters and the Hallow or the Corruption (or the Crimson if you have a world with it generated instead). Treehouses can be very usefull when fighting against a Goblin Army, Pirate Invasion because you can build barricaded rooms on the branches of the Living Tree to snipe with Bows, Magic Weapons or Guns. But beware, the Living Tree can grow high enough to reach the height of Harpies, or even Wyverns depending on the Map Size. If you get lucky enough the Living Tree might hit a Floating Island and you can use the trunk as an elevator, and build your House on the Island.