The capital of Idaho, Boise, is a popular destination for tourists and locals alike. However, there are a few synonyms for the capital that might be used depending on the situation. For instance, some might refer to it as the "Gem State Capital," due to Idaho's reputation as the "Gem State." Others might call Boise the "City of Trees," thanks to the city's many parks and green spaces. Still, others may simply use the phrase "Idaho's Capital" to refer to Boise. Regardless of what it's called, there's no denying that Boise is a beautiful and vibrant city that's well worth a visit.