Everyone is mentioning Warehouse 13...but not Eureka?
Sure its got its comedic elements, but that what's charming about it, it's coming back this summer on SyFy.
Occasionally you can catch re-runs of the BBC Robin Hood series on selected channels (TBS had it for a while on Saturday afternoons) as well as Legend of the Seeker. Like Merlin (too far flung from the traditional stories) they aren't to my taste, but, to each their own, maybe these will work for you?
And I second the Primeval series - kind of like the reverse of Journey to the Center of the Earth.