The 1842 Cap-Haïtien earthquake occurred at 17:00 local time on 7 May. It had an estimated magnitude of 8.1 on the Ms scale and triggered a destructive tsunami. It badly affected the northern coast of Haiti and part of what is now the Dominican Republic. Port-de-Paix suffered the greatest damage from both earthquake and tsunami. Approximately 5,000 people were killed by the effects of the earthquake shaking and another 300 by the tsunami.

The Palace of Sans-Souci, or Sans-Souci Palace, was the principal royal residence of Henry I, King of Haiti, better known as Henri Christophe. It is located in the town of Milot, approximately five kilometres (3 mi) northeast of the Citadelle Laferrière, and thirteen kilometres (8 mi) southwest of the Three Bays Protected Area. Being among the first buildings constructed in a free Haiti after the Haitian Revolution, the Palace and the neighboring Citadelle, are Haitian icons and global symbols of liberty, and were inscribed on the World Heritage List in 1982.