I've been looking for this for quite some time and I haven't been able to find much on it. As far as I can remember it's a western-style animated series.
The premise of the show is centered around this magical object/artifact, I vaguely remember it as a golden egg (but it could easily be like an amulet, locket, medallion, pendant or something kind of spherical) which is split into thirds. The main characters – three(?) children, possibly siblings have one third, the show's villain has the other third, and they are all trying to obtain the other missing third. From what I remember, that final piece keeps teleporting, I think through various periods in history, and by using their own pieces of the golden egg they are able to transport themselves to try chase after it.
As for random and probably pointless details, I think there's a greenhouse/forest which they return to at the end of each episode? There might be a some kind of book kept in that greenhouse which may be relevant to their travels? And there is like one scene I think where they're chasing after the 'piece' on a moving train?
- Adventurers: Masters of Time
- Time Squad
- Horrible Histories (the animated series)
- Time Warp Trio
- Flint the Time Detective.
I remember the art being fairly similar to Liberty's Kids, or The Mummy (animated series) and Time Kid.
Oh and I'm pretty sure this came out in the 2000s, but there's a chance that it aired slightly earlier, around the late 90s, but it almost definitely could not have been anything that first aired after 2011.