There are hundreds of catacombs in Malta, principally found in the neighbourhood of Citta Vecchia, the old capital of the Island. The catacombs are very small, but are in good preservation.
Many of the catacombs were included on the Antiquities List of 1925.
Catacombs of Malta Wikipedia
The catacombs include:Tal-Mintna Catacombs – Mqabba, Malta
St. Paul's Catacombs – Rabat, Malta
St. Agatha's Catacombs – Rabat, Malta
Salina Catacombs – Naxxar, Malta
St Augustine’s Catacombs – Rabat, Malta
Ta' Bistra Catacombs – near Mosta, Malta