There are 35 bridges and arches in Central Park – each one unique. Trefoil arch is, in a way, the most unique, as it’s the only one where each entrance to the passageway is shaped differently. The west-side arch is a round Roman one, while the east-side opening is the trefoil (three-lobed) one you see here.
Trefoil Arch was designed by Calvert Vaux and Jacob Wrey Mould, and constructed in 1862. It serves one of several paths that connect Bethesda Terrace to Conservatory Waters.