ᴀɴᴄɪᴇɴᴛ sᴛʀᴜᴄᴛᴜʀᴇs ғᴏᴜɴᴅ ɪɴ ᴀɴᴛᴀʀᴄᴛɪᴄᴀ

While searching for anomalies in Antarctica, using Google Earth, I found several unnatural looking structures, including some that resemble possible remnants of A̳n̳c̳i̳e̳n̳t̳ settlements.
Coordinates:
Shadow Ancient Settlement: 78°42\’19.86″S 86° 4\’57.09″W
Shadow Medieval Castle: 76°52\’13.87″S 149°59\’14.52″W
Remnants Ancient Settlement: 64°26\’3.64″S 57°59\’44.89″W
Structure old base: 76°40\’34.55″S 125°52\’55.89″W
Top of Citadel: 75°45\’25.91″S 128°11\’59.44″W
Underwater Structure: 66°59\’6.63″S 142°44\’44.82″E
Walls and Walkway: 82°57\’10.15″S 161°34\’7.61″E
Building Structures (3 objects): 76°39\’29.74″S 125°49\’15.36″W
Building Structure: 69°47\’50.62″S 159°33\’41.53″E