54thirty was Denver's highest bar. Tags: Whether it’s the Rocky Mountains or the downtown skyline, we are spoiled with no shortage of views, vistas, and viewpoints here in Denver. What better way to enjoy them than with a cold cocktail on a hot day from atop one of our many rooftop bars? From these panoramic vantage points, it’s easy to enjoy our spectacular sunsets, scope out some post-game fireworks, or just soak in the always-in-development downtown skyline.