The town walls were strengthened, new wells dug, gardens planted, mosques and schools built.
There are several mosques and an Abyssinian church (of the usual circular construction) built of stone.
There were in 1907 3500 Greek churches in the island with 53 monasteries and 3 nunneries; S5 mosques, 4 Roman Catholic churches and 4 synagogues.
The public buildings of chief interest are the kasbah, the government offices (formerly the British consulate), the palaces of the governor-general and the archbishop - all these are fine Moorish houses; the "Grand" and the "New" Mosques, the Roman Catholic cathedral of St Philippe, the church of the Holy Trinity (Church of England), and the Bibliotheque Nationale d'Alger - a Turkish palace built in 1799-1800.
Of the principal mosques the large Buyuk Djamia, with nine metal cupolas, has become the National Museum; the Tcherna Djamia or Black Mosque, latterly used as a prison, has been transformed into a handsome church; the Banyabashi Djamia, with its picturesque minaret, is still used by Moslem worshippers.