Zadužbina is a shallow swallow hole with a well in the lowest part. The name of the site, Zadužbina, in Croatian language denotes legacy of an individual for the common good. Local legend says that the well was built by a Turkish master of Cista during the Ottoman period, for the benefit of the whole village. Since a cemetery with stećaks was created at the northern edge of a swallow hole during the 14th and the 15th century, we assume that the well existed already back then. Several decorated stećaks have been preserved up to today which, according to their reliefs (hunting, round dance, lily, rosettes, crosses, arcades, crossed spears, plant motifs), are related to stećaks in the area. Particularly interesting are ones with the hollows (perhaps for the holy water) carved in the shape of a cross.
Swallow holes were extremely important places in areas without major water sources or rivers since water is retained in them throughout the year. However, in the aforementioned well probably there wasn't always enough water, so in the 20th century, at the edge of the swallow hole, a large deposited matter was built from which the water tank (gustirna, čatrnja) was filled with rainwater.