Stretching along bare hilltop back of Morro is Havana’s greatest fortress, built in 1763 after the departure of the unwelcome English guests whose coming had shown the weakness of the city’s defences. Cabanas, or to give its full name, Castillo de San Carlos de Cabanas (Saint Charles of the Cabin), is nearly a mile in length with a width of about one-fifth of a mile. Its cost was $14,000,000. When King Charles III of Spain, under whose direction the work was commenced, was told the total of expenditures, it is said that he walked to the window of his study and gazed intently out of it, remarking that such an enormous and expensive construction should be visible from Spain. Within the fort are innumerable walks, dungeons and secret passages. To the right of the entrance is the famous “Laurel Moat” where unfortunate Cubans and other political prisoners were shot without benefit of trial. The condemned men were compelled to kneel facing a wall, and this wall marked with bullets in a line nearly one hundred feet long is a grim present-day memento of Spain’s ruthless rule in the island. The spot has been marked with a bronze tablet which records its history. Other fortifications in Havana include Principe Castle, built in 1774, and Atares Castle, 1767. There are two ancient little round towers of defence at Chorrera and Cojimar. FORT SAN CARLOS PENSACOLA BAY--FLORIDA Pensacola Bay is a lozenge-shaped body of water, the entrance to which from the Gulf is at the southern point of the figure, and the southern side is formed by Santa Rosa Island, which stretches out in a long sandy line here to divide sea and inland water. On the western shore, near the head of the bay, is situated the busy city of Pensacola, one of the most active shipping points on the Gulf and also one of the most ancient. About six miles south of Pensacola, and near the mouth of the bay, is the city’s ancient defence, Fort San Carlos de Barrancas, which has gone through ten generations and more of life as humans reckon it and has done valiant service under four flags.