Preheat the oven to 325 degrees. Prepare a 10 inch Bundt pan by spraying it with Pam Nonstick Spray for Baking very thoroughly, or grease the pan very well with softened butter. I did have one tiny area that stuck to the pan, but I was able to cover it with a bit of powdered sugar.
In the bowl of an electric mixer fitted with the paddle attachment, cream butter and sugar together on medium speed. Add eggs one at a time and mix until incorporated. Add vanilla and mix.
In a separate medium sized bowl, mix flour, salt, baking powder, and baking soda. Slowly add 1/3 of the dry mixture at a time, alternating with the buttermilk. Mix on low speed until everything is incorporated.
Pour the batter into the prepared pan and bake for 65-75 minutes. A toothpick inserted into the center of the cake should come out cleanly.
To make the glaze, add the butter, sugar, water, and vanilla extract into a small pan. Over medium heat, melt the butter and dissolve the sugar. Poke holes with a knife into the cake and pour glaze over the top. Allow the cake to cool completely, and then turn out onto a cake stand or platter.