Finally taking the time to document: The "Mars Caves" (found on Google Earth:Mars)
(some are more obvious than others -- each cave located in the "center" of each screenshot)
The caves run in a fairly straight line for ~150 miles (~245k km)...
Cave Entrances (High Level):
Each cave opening is ~300 feet ( ~92 meters) wide...
Cave Entrance #1
Latitude: 41°46'55.85"N
Longitude: 23°53'1.24"E
Cave Entrance #2
Latitude: 43°47'19.86"N
Longitude: 23°43'39.23"E
Cave Entrance #3
Latitude: 44°18'20.38"N
Longitude: 23°41'9.71"E
Cave Entrance #4
Latitude: 44°20'49.18"N
Longitude: 23°40'58.77"E
Cave Entrance #5
Latitude: 44°23'59.91"N
Longitude: 23°40'43.51"E
Cave Entrance #6
Latitude: 45° 0'37.45"N
Longitude: 23°37'29.12"E
Cave Entrance #7
Latitude: 45° 2'34.76"N
Longitude: 23°37'17.95"E
Cave Entrance #8
Latitude: 45°42'39.48"N
Longitude: 23°33'30.57"E
Cave Entrance #9
Latitude: 45°46'4.46"N
Longitude: 23°33'12.14"E
Cave Entrance #10
Latitude: 45°56'55.28"N
Longitude: 23°32'13.24"E
SOURCE: You may verify these images by downloading Google Earth and then selecting "Mars" in the planet selector: