This rugged state capital has its fair share of outdoor highlights, including Kathryn Albertson Park and the Boise River Greenbelt, but Old Idaho State Penitentiary is an eerie highlight. The old prison, opened in 1872, was fully functioning until 1973, and is a fabled piece of Boise's history. The site has 30 historic buildings, including cell blocks and gallows, and features many permanent and new exhibitions detailing the untold stories of inmates and their lives of crime.

You can spend the night in these notorious prisons

The best attraction in every state capital open now