"She weepeth sore in the night, and her tears are on her cheeks; she hath none to comfort her among all her lovers; all her friends have dealt treacherously with her, they are become her enemies." - אֵיכָה,1:2
Tisha B'Av: About Eicha - "It is said that Jeremiah retired to a cavern outside the Damascus gate, where he wrote this book. That cavern is still pointed out by tour guides. "In the face of a rocky hill, on the western side of the city, the local belief has placed 'the grotto of Jeremiah.' There, in that fixed attitude of grief which Michelangelo has immortalized, the prophet may well be supposed to have mourned the fall of his country."
Src: Mechon-Mamre.org and Wikipedia