Located in the New Mexico desert about an hour east of Las Vegas (the New Mexico one) is the Trementina Base of Scientology. The base features a large complex built into the side of a mountain.
The complex houses a vault that stores L. Ron Hubbard's writings etched onto titanium plates and his audio lectures on nickel records. Also at the location is a large-scale symbol of two interlocking circles carved into the desert floor.
The purpose of the symbol is unknown, but it's trademarked by the Church of Scientific Technology (CST) and also located at the Creston Ranch, CA location (both properties owned by CST).
