In every field or discipline, there are journals that scholars consider prestigious and influential. There are a few ways to find these journals in your field.
In addition to prestige, which is difficult to measure, journals are judged by a variety of metrics that look at the impact of articles published in that journal. The metrics usually look at how many citations that papers published in the journal receive over time. The "impact factor" calculates journal productivity and impact.
Eigenfactor looks at the impact of journals that cite each article. On their website, you can search for a specific journal, search by discipline, or search by year. For more information on how they calculate the impact of journals, see their FAQs.