In the cistern, take your time to investigate the documents in a small room.
Then go over to open the big wooden door.
Interact with it and go through with Sam.
Here you'll face the Steering Wheel Puzzle
Head back to the lookout tower island to look through Avery's looking glass...
#53 Combination Lock Tobacco Box
On the main island. Stop at the beach. Get out. It's in the back.
#54 Brass Pocket Sundial
On an island with a sunken shipwreck. It is under water.
#55 Silver and Wook Tankard
Next to the tied up skelleton at the tower island.
#56 Persian Silver Pen Box
At the beach side of the tower island, there is a little cave.
#57 Panamanian Pendant
At the back of the tower island, there is a tiny beach. The treasure is there.
#58 Persian Leather Notebook Case
On the main Island, there are some ledges you can reach when parking the boat next to them.
#59 Deccani Bronze Spouted Bowl
On the main Island, in the big center green area to the right.
#60 Mughal Elephant Carving
In the area with the arches, that remind Nate of the St. Dismas cathedral. On the roof of one of these arch buildings, there is a entrance into a cave.
#61 Ottoman Helmet
Inside the tower above the area with the arches.
#62 Deccani Bronze Vase
When you swing off the tower, don't go on the mud slide, climb over to the left.
#63 Strange Relic
After the mud slide, go to the left and climb up at the left side. On top look over the big gap to the other side. There is a bird bath. Run towards the gap, jump and use the rope point in mid air to swing over.
#64 Hamsa Mythical Goose
Climbing down into the cistern. After the first statue swing, you swing over to the second statue. But climb up to the statue's feet.
#65 Pique Tortoise Shell Box
Down at the cistern, there is a small room with a waterpool. Swim across.