At a 40-foot diameter,this massive horticultural timepiece greets thousands of visitors to the Niagara Falls Botanical Gardens annually, and no two visits in the year may be the same. Its bedding of 16000 flowers is rotated out twice a year to showcase spectacular blooms. Lucky guests can even view the mechanisms powering the clock whether the tower is open. Its original builder, and Ontario Hydro,has powered this clock since 1950.
Source: atlasobscura.com