I suppose the entire city of Boise qualifies as a secret since so few outsiders know much about it.
but here's a secret that few Boiseans know about
:
The Morrison Center for Performing Arts, on the Boise State University campus, was built to resemble the shape of Idaho, which can only be seen from the air (in this image, the bottom of the state is on the left, the panhandle on the right):
