- A sealed container, buried at some location, that contains records of contemporary life - to be rediscovered in the distant future.
- (figuratively) Something reflecting an historical setting by its nature, existing out of time due to isolation or some specific external influence.
2011, Francis Tapon, The Hidden Europe: What Eastern Europeans Can Teach Us, page 135:
- As we've seen, Belarus is a Soviet time capsule that continues only because Russia is keeping it on life support.
something reflecting an historical setting