Mysterious Flower

This flower shows up in my garden every summer and it's so colorful and looks really nice when I'm out on the patio, but I have no idea what it is.  Any thoughts?  Today we took my sister for an MRI, but the traffic was crazy out there.  The start of a holiday weekend - I think I'll stay home for the rest of it!

“The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science.”
― Albert Einstein