sentences:  Humans can enter this cave only on one day in a year - The 11th day (Ekadasi) in the bright fortnight in the month of Vrischikam (November–December), that is Guruvayoor Ekadasi.All other days are meant for ghosts.It is believed that the bottom of the temple is also a cave, and a golden vilwa tree exists there, and thus the place came to be known as 'Thiruvilwamala'.