Which U.S. state capital is not connected to the interstate highway system?

Juneau, Alaska is the only U.S. state capital not connected to the interstate highway system. This is primarily due to its geographical location; Juneau is situated on the Gastineau Channel and is surrounded by water and mountains, making conventional road access impractical. The city's isolation means that it lacks the necessary infrastructure to link up with the interstate system, which is designed for long-distance travel connecting major urban areas across the country.

Instead of highways, transportation to Juneau typically relies on ferries and planes. This unique situation distinguishes Juneau from other state capitals, many of which are easily accessible via interstate routes. Understanding this aspect of Juneau's connectivity highlights the challenges faced by certain regions in establishing conventional road networks, particularly in areas characterized by difficult terrain and environmental factors.