"countryclub.com" - ie, a bunch of fossils :)

fossilised.dev .. maybe british spelling.

palaeontology.dev ... too awkward.

museum.dev has a sort of "this is dead" ring to it.

Ironically what fossils are stored in within a museum is referred to as a "repository"..

Well, there's only 2 hard problems in computer science right?

boneyard.dev evokes something dead but that name kinda goes hard