Above a fishing village overlooking the narrow entrance to the Bahía de Cienfuegos (35 km/21 mi south of the historical center) is the Castillo de Jagua, a Spanish fortress built in 1745 to keep out pirates who had grown accustomed to trading with locals. It's completely refurbished (even the drawbridge works) and has a historical museum with weapons and other antiques. The dungeon houses a bar and restaurant. On your way down, note the small chamber beneath the steps;
prisoners were chained and tortured here. Considering the existence of this chamber, and a working drawbridge, it's not advisable to try sneaking out without paying your bill.
Jagua, Cienfuegos, Cuba