More than one million fossils and artifacts were unearthed during the construction the Diamond Valley Lake reservoir in Hemet. These time-swept relics make their home in the Western Science Center's museum complex, creating a bridge between ancient eras and the scientific advances of the future. The campus itself is steeped in advanced design tactics, making it the first museum in California to earn a Platinum LEED Certification from the U.S. Green Building Council. A rooftop covered with 3,000 solar panels provides more than half of the museum's power needs, and a combination of heat-resistant windows and forced-air circulation keeps the interior cool while spending less energy on air conditioning and ice sculpture maintenance.

A journey through the ages begins from the moment visitors step from the parking lot and under the Life on Earth Timelime, a 156-foot corridor of geologic time rings from Pre-Cambrian to Holocene that leads to the museum lobby. Inside, they explore permanent and temporary exhibits, including "Max," the largest mastodon skeleton found in the Western United States and the Discovery lab highlighting the tool contemporary architects use every day. Crowds can take a seat in the immersion theater with a 270-degree screen to watch a pair of short films about the time when giant creatures roamed California and how the region was excavated and preserved.