However, there are several problems with time travel. A time machine would need fuel comparable to the power of the star. (Kaku) Going at such speed would kill any human that attempts it. (The Week) Also if by some miracle you manage to build a machine that somehow bypassed these problems, there is no way back leaving thus trapping you in the future (NASA). So even though in theory it is possible, it is unlikely you'll be visiting ancient Rome anytime soon.
However, this has problems too. No wormhole has ever been discovered. As of the time writing, they only exist in the realm of theory. (The Week) According to current theories, wormholes would be 10–33 centimeters large. (Redd) As such, wormholes don't seem particularly practical either.