Fire Caves

The Fire Caves are caverns on Bajor in which the pah-wraiths were imprisoned by the Prophets after their attempt to seize control of the Celestial Temple. The Bajorans were wary of them and regarded them as being "haunted". However, they were a popular attraction for non-Bajorans.

The Cardassians found the Bajorans fear of the Fire Caves to be amusing, but never mounted an expedition during the Occupation. (DS9 episode & novelization: "What You Leave Behind")

Jake Sisko wanted to see them when he and Benjamin Sisko arrived on Deep Space 9 in 2369. He had the opportunity to visit them later that year with his father, but chose to help Nog study instead. (DS9 episode: "The Nagus")

Keiko O'Brien visited the Fire Caves in 2373 and was possessed by a pah-wraith who was not imprisoned with the others. (DS9 episode: "The Assignment")

Kai Winn Adami and Skrain Dukat began plotting to release the pah-wraith from the Fire Caves in late 2375. (DS9 episodes: "The Changing Face of Evil" & "When It Rains...")

After finding out how to do so with the Book of the Kosst Amojan, they travelled to the Fire Caves where Winn read from the Book, making the caves burst into flames.

Some time later, Winn poisoned Dukat, giving the pah-wraith the sacrifice they needed to be freed. However, Dukat was the pah-wraith's Emissary who they had stopped from dying and restored him to his Cardassian self.

Benjamin Sisko later travelled to the Fire Caves where he confronted Dukat. Sisko's nemesis killed Kai Winn, who had attempted to destroy the Book. As Dukat was distracted, Sisko managed to throw himself and his enemy into the flames, destroying the Book and sealing Dukat away with the pah-wraith. (DS9 episode & novelization: "What You Leave Behind")

Rebecca Emmanuelli had visited the Fire Caves sometime before 2380. (Articles of the Federation)