Trail Ruins

Trail ruins are buried structures which work as archeology points where both suspicious sand and suspicious gravel generate. The trail ruins may be found in a few temperate, cold and snow-covered biomes and resemble ruined villages "from a lost culture." Like ocean monuments, trail ruins have no chests; moreover, their loot is found in the aforementioned suspicious blocks.

Structure
Trail ruins are structures that generate mostly underground with only the tip above the ground. They resemble small, ancient settlements - each trail ruin has a main road which connects multiple small buildings and a tower. The entire structure is buried in sand, gravel, dirt, and coarse dirt, as well as some suspicious sand and suspicious gravel.

Location
Trail ruins may be found on land or underwater, typically near a river, an aquifer or an ocean. The structure is found in the taiga biome and its many variants, as well as in old growth birch forest and jungle biomes.

Layout
The structure is composed of a central tower made of terracotta and glazed terracotta, the tip of which is the only part of the structure that does not generate underground. Adjacent to the tower generates two rooms and a road made of cobblestone, stone, stone bricks, and its variants. Along the road can spawn other small buildings and decor made of mud bricks and terracotta.

File structure
All trail ruins structures found below are located in the folder client.jar/data/minecraft/structures/trail_ruins.

Trivia

 * Trail ruins are the only natural source of mud bricks.
 * One of the two buildings that generate adjacent to the tower will always have a ladder, which (if you dig one block forward and one to the side) will lead to an opening in the wall of the main tower.