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Owner Don Lansing has resisted temptation to commercialize the field where 20,000 people visit each year and sign the guest registry, making it one of the state's top tourist attractions.

Admission is free, and a few token souvenirs are for sale. The field is mowed, manicured and irrigated thanks to voluntary donations.

Is this heaven? As they say in the movie, "No, it's Iowa."

Missing: The Partridge Family's Bus — Of course, some movie props are forever lost. "The Partridge Family" bus, with its patchwork coloring and "Careful, Nervous Mother Driving" sign, has vanished.

Epting notes that it was parked for many years outside a Mexican restaurant in East Los Angeles. But in 1987 — 13 years after the show's cancellation — the restaurant's parking lot was repaved, and the bus shipped to a junkyard, its patchwork coloring long having faded beyond recognition.

"At least, we'll always have the music," Epting says. "And the reruns."

Buck Wolf is entertainment producer at ABCNEWS.com. "The Wolf Files" is published Tuesdays.