They are small grottos cut in the rock.
The cathedral, of the 12th century, has a carved portal and three apses decorated with small arches and pilasters, and contains a fine pulpit and episcopal throne in marble mosaic. Near it are two grottos 1 To the period after 335 belong numerous silver and bronze coins with the legend Caleno.
Amongst the best-known are the grottos of Adelsberg, the larger ones of Planina and the Kreuzberghohle near Laas.
At Syracuse also there are very extensive catacombs known as " the Grottos of St John."
He is always associated with his brother Trophonius as a wonderful architect, the constructor of underground shrines and grottos for the reception of hidden treasure.
Here are the temples of Debfld, the temple and quarries of Kertassi, the temples of Kalabsha, Bet el Wali, Dendr, Gerf Husn, Dakka, Maharaka, Es-Seba, Amgda and Derr, the grottos of Elles ya, the tombs of Aniba, the temple of Ibrim, the great rock-temples of Abu-Simbel, the temples at Jebel Adda and Wadi Halfa, the forts and temples of Semna, the temples of Amgra (Meroitic) and Soleb.
Its gardens, however, with their clipped hedges, grottos, fountains, and cypress avenues, are said to retain their original Moorish character.
The surrounding gardens are adorned with fountains, cascades, lakes and grottos, the principal fountain sending up a jet of water 180 ft.
As seen from the rock of Ghulgulah, Bamian, with its ruined towers, its colossi, its innumerable grottos, and with the singular red colour of its barren soil, presents an impressive aspect of desolation and mystery.
In the neighbourhood is the celebrated Aggtelek or Baradla cavern, one of the largest and most remarkable stalactite grottos in Europe.