Baigong 'alien pipes'

In 2002 Chinese papers reported iron-rich 'pipes' in a hill near Delingha, Qinghai, claimed as relics of an alien launch site.

2002 CE · 37.16, 97.00 · status: explained

The sceptical view

Analyses reported plant matter and tree rings: fossilised tree roots or natural concretions.

Sources

1. Wikipedia: Baigong Pipes