Arma 3: Points of Interest
"Atlantis" can be found at 150068 (source)
Altis also has its (nicer) Stonehenge with a decorative skull on the top, located in the North-East corner of 144061 at Cape Makrinos.
A hidden hideout (and what is supposedly its owner's skeleton) can be found at 080094 (source)
TRPASLIK is written with rocks on the bottom of the sea at 229061 (source) Trpaslik is Altis' Environment Designer (REPORT IN).
The mentioned Pirate Cave is located at 042073 (how-to video)
V-22 Osprey wreck
The V-22 Osprey wreck found South of Stratis airport (coordinates 014047) is a nod to Arma 2's vehicle (video)
Same as in Operation Flashpoint, Malden 2035 has its own Stonehenge, located in the North-West corner of 058101 coordinates.
The Bushlurker Monument
At 027074 lays a monument in tribute to Paul “Bushlurker” Pelosi (1960-2017) who has worked on many community terrains, including Malden for CWR2. He passed away some months before Malden 2035's release.
The statue itself was made by Kiory and announced on the forums, and was later implemented officially.
- RedEye Mouse YouTube channel - source of most of this page's Easter Eggs