investigation
something to try to find out what happened
fascinating
very interesting
artifact
an object that was made by a person
mysterious
that no one can understand or explain
reasonable
based on good logic, or reason
comfortable
giving a sense of ease, relaxation, or relief
evidence
facts that make you believe something is true
usable
something can be used
ancient
very old
strange
unusual and difficult to understand or explain
site
a place where a building used to be, or something happened