There are few places in the world that can come anywhere close to the level of spirituality that Nepal inherently possesses, and we feel like that alone makes it a country that you should visit at some point or another over the course of your life. However, there is a pretty good chance that the sheer quantity of temples in this region will be too much for your to swallow, so you might want to start slow by visiting the major temples first and foremost.
Nepal is not associated with Hinduism quite as often as India is, but the truth of the situation is that it has one of the most amazing Hindu shrines in the continent. This shrine is called the Muktinath Temple, and it is said that the creator of Tibetan Buddhism meditated there and achieved enlightenment. This is because of the fact that this temple has a direct pathway to spiritual powers that most people could never even dream of gaining access to, and it is also a place that is steeped in no small amount of mystery.
The fact of the matter is that no one really knows who built Muktinath, since it was constructed thousands of years in the past. Even if there were written records that were drafted in that era, the passing of millennia likely weathered them down to dust. You can never take places like Muktinath for granted because they are gradually starting to disappear from the world, so you should go and take a look at them and experience them while you still have the chance. Otherwise you might feel like you missed out on something that you would have cherished a lot.