What is this tall red flower I saw in someones front lawn?

Ok, so I saw one of the houses in my neighborhood last year. I have no idea which house it was, but I remember the flowers. I would guess that they were 3 or 4 feet tall, with a large stem, and a huge single bloom at the top. I believe it was red.

I want these flowers in my yard. Help me. :)

I will also accept similar flowers, with different color blooms. This person had them run the length house. It was beautiful.