A few times I've been discouraged by visa processes or just did not have enough time to deal with it. This led me to do some research.
There are some visas that may be more powerful than you think for Nigerian passport holders. With these visas you can easily visit other countries without a visa…dang!
Many of these countries believe that if you have a U.S, U.K, Schengen or Canadian visa, you must have gone through some thorough checks. The visas therefore grant you access to other countries for a short stay (please check the length of time for each country).
If you were looking for your next holiday destination, here is a list of some of the countries I found. You might need a map to locate some of them, haahahaha.