Pyramid

The Pyramid is a rare desert structure composed of Sandstone Brick. An experiment generating one hundred small worlds using version 1.2.0.3.1 showed an 83% chance of having no pyramids, a 15% chance of having one pyramid, and a 2% chance of having two pyramids, however they are slightly more common since version 1.2.3. They can contain treasure rooms with a chance of unique loot like the flying carpet, a Sandstorm in a Bottle, the Pharaoh's Mask and the Pharaoh's Robe.

They usually spawn partially exposed to the surface, although mining or the use of a Spelunker Potion is often better to reveal them. In addition to unique treasures, they offer unique decorative banners and a variety of pots and coins stashes. The coin hoard can be considerable, especially if bags of gold coins are found. Pyramids can also be found in other biomes, reportedly being found in the middle of the jungle if said jungle overlaps with a desert on world generation.

History
Naming the world Pyramid may affect spawn rate.(Unconfirmed)