Targeting entries in a structure
To get a specific entry you need to know the id or slug of the entry. If the slug for Chicago is "chicago" (you find the slug in the side panel of the entry edit screen), you can get it like this:

{% set chicagoEntry = craft.entries.slug('chicago') %}


But hardcoding slugs and id's into templates is rarely a good idea. If you explain a bit more what you're trying to achieve, maybe we can provide a more helpful answer.

If you're trying to turn the structure into a menu of sorts, have a look at the documentation for the {% nav %} function, it was made specifically for this.