A famous ancient site that has evidence of Buddhist ideas infiltrating China is the Dunhuang Caves. From a western viewpoint, archeologist Aurel Stein discovered a room full of ancient documents in these caves in Dunhuang, Nothwest China.
Here's Aurel Stein in the Tarim desert.
The Wikipedia entry notes that:
Stein's greatest discovery was made at the Mogao Caves also known as "Caves of the Thousand Buddhas", near Dunhuang in 1907. It was there that he discovered a printed copy of the Diamond Sutra, the world's oldest printed text, dating to AD 868, along with 40,000 other scrolls ( Link: http://en.wikipedia.org/wiki/Aurel_Stein )
Some scrolls described the paradise to which the Amitbha Buddha promised to take (at death) his followers, who had called on his name, and some of the illustrations (wall art) seemed based on those Sutras (scriptures), like this one:
And In another Pure Land, or Paradise painting:
Shakyamuni, the historical Buddha, with his hands in the vitarka-mudra (gesture of preaching), sits between two bodhisattvas. A dancer and an orchestra perform before him. Another group sits below them. The Buddha has the sun and the moon on his robes, the cosmological emblems of Mount Shumeru. The scene is probably intended to represent Shakyamuni's cosmic aspect as expounded in the Lotus Sutra. Two mythical creatures standing on golden islands, the double-headed jiva-jiva and the kalavinka, flank this second group. A row of donors are shown at the base of the painting.
Even Jewish documents have been found there:
Selihah (penitential prayer) leaf written in Hebrew. 8th or 9th century CE
All these illustrations and documents have been important in re-constructing the conversion of East Asia to Buddhism, and the presence of many other religions in the caves.
Another scholar, important to the study of these documents, was Paul Peliot seen here in the "library cave" which contained some 50,000 documents, the largest group of ancient documents ever found.
Paul Pelliot examining manuscripts in the Library Cave, 1908
IF such things interest you, the caves are not difficult to visit these days. This China Central Televison documentary shows what you could see in the area.
https://www.youtube.com/watch?v=Sb0FaBfzRxg