There are two sculptures with each two mermaids in Bologna’s Montagnola Park.   This is near the center of the city, and is the city’s oldest park.   ( map )

Mermaids in Montagnola Park, Bologna

Mermaid statues in Montagnola Park, Bologna. Photo by Alfred Hockenmaier.

La Fontana del Sarti - Parte II

The mermaid sculptures were created in 1888 by local artist Diego Sarti, famous for many works of art.   These were created in concrete for the 1888 National Art Exhibition, and although they were supposed to be dismantled after the exhibition, popular acclaim resulted in them being preserved as part of the city’s history.

References:
http://certosa.cup2000.it/chiostro/persone.php?ID=483992&gallery=&img=6
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