Let's make ancient structures, devices, and scripts. Follow the format I use (current year is 2000):
Name: The Stones of Maralqui
Location: North Pole of Luna
Age: 6 million years
Origin: Unknown, likely Extraterrestrial
Description: A small seven-petal flower pattern of multicolored dodecahedron crystals.
Extra info: Highly radioactive, magnetic
Name: Alios Structure
Location: Low Janus Orbit
Age: 37,000 years
Origin: Extraterrestrial
Description: A large, porous structure (similar to Hyperion) composed of 30% unknown metals, has a large lithium battery at it's core
Extra info: None
RULES:
No magic/sci-fi nonsense (relics must abide by laws of science)
No interguild memes
Minimum age is ~20,000 years
No fictional locations (Either in solar system or on well-known exoplanets)
Check back on these rules often as they may change over time due to trial-error