In Ringbahn We Trust (Germany)
The route runs along the entire Berlin Ringbahn track, and gives a better overview of the city and it's diverse neighborhoods than the Berlin marathon could ever hope for. You can also claim to have bagged an Ultra as the route is mildly longer than your usual run-of-the-mill marathon. You can complete the course clock-wise or counter-clockwise. Either way, starting and end-point remain the same, as we're dealing with a circular route.