Structures

Alpha/Beta model of a Robotics Facility

Early model of a Templar Archives

Early model of a Pylon

Early model of a Twilight Council

Early model of the "fishbowl" Fleet Beacon

Early model of the Cybernetics Core

Early model of a Gateway

Early model of a Nexus

Early model of the Robotics Facility

Early model of a Assimilator

More expensive Pylon with additional abilities

Null Shield, Shield Recharge, Cloak

Protoss defensive structure that would shoot out a beam from the top crystal, it was later repurposed into a detection tower like the Sensor Tower then finally ended up as the Dark Shrine.

The Galaxy Map Editor contains the Eye of Adun and Energy Crystal (Monolith), structures that use the same model as the Dark Shrine.

Early model of a Robotics Bay

A renamed version of the Citadel of Adun it was meant to make an appearance in StarCraft 2 as a prerequisite to warp in units from the production structures to select power fields

The War Shrine was a Protoss building in StarCraft II. It was used to upgrade the Protoss Zealot Charge ability 

The War Beacon was a Protoss structure in StarCraft II. It was required to warp Colossi from the Robotics Facility and was also the center for upgrades to the Colossi. This function was replaced with the Robotics Support Bay 

More expensive Pylon with additional abilities

Proton Charge, Shield Recharge, Argus Link, and Shield Research

Concept art of a Nerazim Dark Shrine