Grotta Zinzulusa

Grotta Zinzulusa is a limestone cave carved into the coastal cliff near Castro in Apulia. The cavern runs about 150 meters deep into the rock face and displays numerous formations hanging from the ceiling that resemble loose threads.

The first written record of the cave dates to 1793 when Antonio Francesco del Duca, bishop of Castro, described the site in a letter. Systematic exploration began after 1923 and led to the discovery of several previously unknown animal species.

Scientists discovered multiple endemic species within the cave, including Typhlocaris salentina and Spelaeomysis bottazzii, contributing to speleological research since 1923.

Guided tours allow access to the first section of the cave and run throughout the day. Visitor numbers are controlled to protect the delicate geological structures and interior ecosystem.

At the rear of the cave lies a basin called Cocito where stratified water creates separate layers of fresh and brackish water. This separation forms distinct habitats for organisms adapted to each different water condition.