Herradura (Spanish: "horseshoe") are architectural features associated with the Ancestral Puebloan road network.
They feature three-foot-tall curved masonry walls in the shape of a "D", "C", or horseshoe, with a diameter of 10 to 30 feet (3.0 to 9.1 m).
Herraduras are found on hills and berms near Chacoan roads.
They are not believed to have been residential, but the presence of broken pottery near them suggests they might have been roadside shrines.
[1] This New Mexico state location article is a stub.