Hanoi Old Quarter
A warren of narrow, congested streets, the old quarter is fascinating its own way. The streets are two-way, but narrow enough that I would consider most of them single-lane roads. There are sidewalks, but the shops tend to spill out onto them, and people park their scooters on the sidewalk. There are numerous cafes, many of which offer famously cheap beer, and Hanoi's renowned silk district is nearby as well.