Pillar

The Pillars are tall, ancient structures found in Salt, created by an unknown civilization. They only exist on Ancient Islands and usually signal the existence of an Ancient Altar, a Sarcophagus or a Cultist Ritual Site.

Besides being a landmark, they have no physical uses beyond pointing out other useful landmarks. They cannot be mined or destroyed with bombs.

Source

 * Ancient Island
 * Ancient Sarcophagus
 * Ancient Altar

Trivia

 * They are particularly useful for players sailing, as they can often be spotted from a distance, even sometimes being seen before an island's trees have loaded. This is especially useful for players trying to find Ancient Islands or Cultists.