The Meteorite point of interest can be found to the north of Roanoke Valley, to the northwest of the Roanoke Valley writing on the map. Explore the area to find the remains of a meteorite and its impact zone.
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Abandoned Trading Post
The Abandoned Trading Post can be found to the east of the meteorite point of interest, along the North Eastern Railway tracks. Inside the building, it's also possible to find the Isabelle Barlow Cigarette Card.
The Fossilized Man can be found not too far from the meteorite. This point of interest is located near the train tracks at the point where they intersect to the west of the Roanoke Valley writing on the map. The Fossilized Man is precisely found on the low ledge that's close to the train tunnel, within the rock wall.
The Meteor House is found directly to the north of the Roanoke Valley writing on the map, right where the fork in the road is to the south of the train tracks. You should find a house in the area, with the remains of another meteorite inside. Inspect it and you will be done.
The Old Tomb is located to the southwest of the Roanoke Valley writing on the map and right to the north of the first "N" in Annesburg on the map. The tomb is precisely to the west of Deer Cottage, past the river and very close to the fork in the road. Inside the tomb, you will also find the Viking Hatchet next to the altar and the Ancient Viking Comb.
Old World Scripts
The Old World Scripts are found in the northeastern part of the map. Head to the northeast of Annesburg to find a large rock close to the ledge. This is the point of interest to inspect.
Trail Trees (I)
The first Trail Trees can be found near where the road bends to the north of the gap between the "V" and "E" in New Hanover on the map, to the west of the Kamassa River. The trees to inspect are near a wooden bridge in the area.
Trail Trees (II)
The second Trail Trees can be found just a little to the north of the first ones, directly to the west of the last "R" in Kamassa River on the map. Go north of the wooden bridge in the area and you will eventually find the trees on your left.
Trail Trees (III)
From the previous Trail Trees location, continue going north until you reach a small bend in the path which is directly west of the "R" in Kamassa River on the map. The trees are on the right if you're coming from the south.
Trail Trees (IV)
The final Trail Trees are located to the northeast of the previous ones. You can find them on a hill that's directly west of the second "A" in Kamassa River on the map.
The Manmade Mutant can be found to the west of the Van Horn Trading Post. Get on the road leading south of the trading post and then proceed west until you reach a fork in the road right past the train track. Here, go north until you find a house. Get on the second floor by climbing on a nearby cart and inspect the Manmade Mutant inside the room.
The Serpent Mound can be found to the southwest of the Van Horn trading post. Get on the road leading south of the trading post, proceed west past the fork in the road leading to the Manmade Mutant and look to the south to find a wooden tower. Climb on top of it to spot the Serpent Mound.
The Tiny Church can be found directly to the northeast of the Lakay writing on the map. The church is rather small, but it's not difficult to spot, considering it's also close to the road leading to Lakay. There are usually alligators nearby, however, so be careful.
Grays' Secret is among the most difficult to reach point of interest, as you are forced to get inside Caliga Hall to the east of Rhodes, which is full of guards. For this reason, it's always better to find this point of interest at night, when visibility is reduced. The Grays' Secret can also only be found after completing Chapter 3. The actual point of interest is found inside the house on the western side of Caliga Hall: you can find a letter on the table on the back porch of this house.
Grave Sites 4 & 5 (Hosea & Lenny's Gravesite)
These two Grave Sites can only be found during the Epilogue. They are located to the north of the "A" of the Bayou Nwa writing on the map. Finding all grave sites also unlocks a trophy/achievement.
The Phonograph is found directly south of the "W" in Bluewater Marsh on the map. The item to inspect is found inside a houseboat docked on the river. Inside the houseboat, on the top level, you will also find a Miss Maud Delancey Cigarette Card.
Ghost of Agnes Dowd
If you are traveling through Bluewater Marsh between 9 PM and 3 AM, you might notice the Ghost of Agnes Dowd in the distance. The ghost disappears if you wander too close to it. The location of this Point of Interest is not fixed.
The Withered Arm point of interest is located in the Lannahechee River. To find it, head slightly northwest of Crawdad Willies and south of the abandoned building just before the train tracks. The Withered Arm is found in the area between these two locations.
The Abandoned Church can be found to the south of Bolder Glade and to the east of the "W" in Scarlett Meadows on the map. The church is a location you will explore during one of the story missions, so you can just inspect it while playing through the story.
Bolger Glade can be found very easily by going a little to the south of the "A" in Bolger Glade on the map. The whole area looks like a maze that has been likely used during a battle. Inspect it and it will be recorded among the points of interest.
Like for the Grays' Secret, the Braithwaites' Secret can only be found after completing Chapter 3. As the area is full of guards, it's also better to try and find this secret during nighttime. To inspect this point of interest, you must head to the eastern side of Braithwaite Manor where multiple houses are located near the water. If you are in the correct area, you will start hearing the voice of a young girl. Search the area to find a very small house: the secret is inside.
Pleasance can be found directly to the north of the "O" in Lemoyne on the map. In the area, you will find several abandoned buildings, and some of them also include several Cigarette Cards.
Otis Miller and the Boy from New York
The Otis Miller and the Boy from New York book can also be found in the Pleasance community located to the north of the "O" in Lemoyne on the map. The book is found on a table in the house found to the south of the settlement.