LOUISVILLE, Ky. (WHAS11) – A forgotten piece of the city’s wild riverfront days have been rediscovered and getting new life as the building block for a future project in the city.

The Metropolitan Sewer District recently discovered historic cobblestones during an excavation on Story Avenue between Frankfort Avenue and Cable Street in Butchertown.

In addition to three layers of cobblestones, MSD crews also found trolley tracks that were not on any maps.

Cobblestones were used by steamboats visiting Louisville for ballast. When they weren’t needed, they were thrown on the wharf.

The stones will be used in sidewalks and stone edgings at the new Waterfront Botanical Gardens being built at Frankfort Avenue and River Road.