Question
We have a very large (about 3 1/2 feet diameter at the base) oak tree that flowers every spring with peach and white tulip shaped flowers with a yellow center.  Everyone thinks we are nuts until the spring when we bring a branch that has the oak leaves and flower still attached.  I've never found anything like it on the internet and was curious of what it might be.  We live in Michigan and this tree is surrounded by about a dozen other oaks of the same size - none of which that produce flowers.  

Can you help?

Answer
There are many trees in the world that I have not seen but oaks have catkins type flowers not the ones you described. I think what you have is a Tuliptree (Yellow Poplar)
Liriodendron tulipifera. Here is a web link to this tree. See if the leaves and flowers look like this IF not send me a picture of the leaves, bark and flowers to [email protected] and I will try to ID it for you.

http://www.oplin.lib.oh.us/tree/fact%20pages/tulip_tree/tulip_tree.html