Pyramids of Shadowlands
There are four ancient pyramids in Shadowlands. They are built into a forest of leafy palm-like trees and located quite near each other. One of the pyramids, the Pyramid of the Forbidden, is a secret level and can't be accessed by walking normally. You do have to use a Foot, though.
The purpose and the builders of the pyramids remains a mystery. The name of one of the pyramids, the Pyramid of the Gnosticene Ancients, suggests that there was an ancient Gnosticene civilization that built the pyramids.
Pyramid of the Moons
Symbol: A waning crescent moon
In the Pyramid of the Moons there is an easter egg, Mooning Keen. This pyramid also contains a secret that can take Keen to Pyramid of the Forbidden.
Pyramid of Shadows
Symbol: The Sun, half of it in shadow
Pyramid of the Gnosticene Ancients
Symbol: An eye
The home of the Treasure Eaters, and the only place in Shadowlands they can be seen in.
Pyramid of the Forbidden
Symbol: A palm of a hand
A hidden pyramid, only accessible through a secret in the Pyramid of the Moons. Considerably harder than the other pyramids. Even a sign at the beginning of the level tells Keen to "watch out".