Ancient Temple

It spawns underground and has a lot of suspicious gravel with a probability of geting a unique loot: the improbability table.

Abandoned VHS House

This house was from a tester, but now is abandoned, it was corrupted and iserted into the game as a feature, you can find it in cold biomes and if you loot it there's a probavility to get a Porky Plush.

Sinner Tree

It spawns very far away, it's an easter egg structure with some lore and no loot.

Ruined Hospital

It spawns in many types of biomes such as deserts, meadows, badlands, etc...

It was burned and inserted into the code as a feature, there you can find a Oveji Jones Plush.