LOS ANGELES (CBS) — Anticipation is growing for the “Levitated Mass” exhibit that trekked slowly from Riverside to Los Angeles.

The 340-ton granite boulder is now being held in a temporary gantry over a visitor walkway on the Los Angeles County Museum of Art’s campus along Wilshire Boulevard.

“People come day and night to peek through the fence on 6^th street and at the end of campus as well,” LACMA’s Miranda Carroll said. “People are fascinated by it.”

Michael Heizer, the artist behind “Levitated Mass,” first conceived of the idea in 1968, but only discovered the right boulder decades later in Riverside County.

“It caught everyone’s imagination, so we could get millions of inquiries about when it’s going to open, when are we going to see it,” Carroll said.

Museum officials hope to unveil the exhibit in mid-June.