The Bullitt Center has drawn people from around the world to see its precedent-setting sustainability features, creating a sort of architectural “pilgrimage site” that proves the capabilities of regenerative architecture and the potential it has to lessen humanity’s environmental footprint. Although much of its technology has been built upon, it remains a true marvel in the built environment and AEC industries, forever changing the way we build with its zero-energy footprint and its adherence to the Living Building Challenge, the most arduous and ambitious sustainability certification in the industry.