Download new Google Earth Beta here. More user-friendly controls, better resolution in many locations. e.g.
Cultural Revolution remnant mega-slogasn seen from space - 100-150 km ESE of Hami 哈密 City (N of Yandun烟墩), Xinjiang
(You can enter latittude/longitude coordinates shown in local left corner of the pictures to "fly" directly to the locations, use space to separate minutes/seconds, and comma to separate longitude from latitude)
More pictures with coords can be found at here, enjoy the treasure hunt.
Precise locations of each slogan shown here
In Spratly, Vietnam has built many airports through aggressive land-filling, before our friends in Taiwan started debating on whether to build it or not.
(Note there is a boat on the west side of the island)
More pictures with coords can be found at here.
1. Precise size of the banners were measured. e.g. 300mx50m for the banner shown above.
2. It was said (in comment field) these were painted for airplane pilot training purposes (by "No 8 Pilot College" of the airforce), to assist them to find the small airport when they land. You can see the airport on google earth near of the banner in the middle of the cluster. In 1960s we did not have GPS/etc.
Update: It is located in the east of Carmel Circle, which belongs to Red Star #2 Ranch of the Contruction Corp.