In 1988, Valle de los Ingenios and neighbouring Trinidad were declared a World Heritage Site by UNESCO, because of its testimony to the early sugar trade industry.

The abolition of slavery by the Spanish in 1820 made the practice of importing slaves more difficult; but it was not until the Wars of Independence in the 19th century that the economic dominance of the area came to an end, as many of the sugar mills were abandoned or became run down.

[2] According to experts, the bell that formerly hung on top of the tower announced the beginning and the end of the work day for the slaves, as well as the times for prayers to the Holy Virgin in the morning, midday, and afternoon.

The height and magnificence of the tower served to display Iznaga's power over his slaves and his stature in the sugar industry and local society; at one time it was the tallest structure in Cuba.

A recognised landmark of the region, the Iznaga Tower testifies to the area's flourishing material culture in the Spanish colonial period.