Castillo de los Tres Santos is an old Spanish coastal fortress and the map for the Special Operation Los Tres Santos. Colonel Cavallo is auctioning PG-240X to the highest bidder inside.
A historic fortress turned into a weapons fair. Wealthy buyers mingle at the Yara Arms Expo Center while guards patrol the grounds. Lots up for sale include an old tank in the vehicle demonstration area.
From the monument, follow the dirt roads northwest to the Expo Center. Go round the back, watch for booby traps and shoot the security camera before you enter. Kill Cavallo on the second level for the cooler key, then take the PG-240X from the stage. Cool it in water on the run back to the monument and hold off the waves there.
Take the side road past the south checkpoint and over two wooden bridges to the Hillside Chapel. The blue key is at the southwest end of the cemetery. Then ride the zipline by the raised blue shrine to a ruined round tower to the north, where the stash sits.
A memo shows Outcasts were moved to the fortress at Cavallo's request, which hints at what else goes on there.
¡Danza! Cave
¡Danza! Cave is a flooded old nightclub in a cave in Cruz del Salvador, Valle De Oro. It hosts the treasure hunt And The Beat Goes On..., where you search for the DJ booth.
Antón Castillo's Villa
Antón Castillo's Villa is El Presidente's private home on Isla del León, north of Esperanza. You only go there in the late story operation The Lion's Den, and it is guarded by Yaran Special Forces.
Azúcar Plantation
Azúcar Plantation is a sugar plantation in Valle De Oro, the farming heartland of Yara. You pass through it in the Máximas Matanzas operation Precious Cargo, and an Honor Idol can be found on the grounds.
Image: UbisoftBioVida Lab Facilities
The BioVida Lab Facilities are El Doctor's labs in Barrial, Valle De Oro. You raid them in Angel De La Muerte, the last Valle De Oro operation, so come ready for poison.