He purchased The London Bridge, which was "falling down", from the city for $2,500,000 in 1968. The bridge's meticulous reconstruction in Lake Havasu City was completed by 1971.

Robert McCulloch's motivation for making the purchase was to draw attention to the new city, bring in tourists and attract prospective retirement residents to his real estate developments.

The London Bridge spanned nothing but sand when it was first moved to Lake Havasu City. To put the bridge to good use, the Bridgewater Channel canal was constructed between Thomson Bay and Lake Havasu.

Since then, the London Bridge has become Arizona's second largest tourist attraction after the Grand Canyon.