Lighthouse

As of version Atum 2.2 this feature has been removed
The lighthouses are represented by large red accented towers with a Heart Of Ra beacon at the top. If you destroy the glass you can destroy the beacon, be warned as it will blow up. But this is one way to obtain a Heart of Ra. Fair warning the Sunspeakers will become hostile to the player if you do this.

They only spawn in the Limestone Mountains biome.