"r/Route66 Recommends..." Favorite Man Made Site Edition

As part of the “r/Route66 Recommends…” series, what is your Favorite Man Made Site along the Route? Anything that is Man Made (or nature altered by human hand to make something new) is allowed!

With plenty of cool buildings, art installations, bridges, neon signs, and stretches of road, there are plenty of man made creations along Route 66! Let r/Route66 know which one(s) is/are your favorites!

Thanks!