Explore the hidden gems of wine tourism as Business Insider highlights the best underrated wine regions. Visit Alentejo in Portugal, known for its full-bodied reds and aromatic whites from indigenous varietals like trincadeira and antão vaz. In Southern Sweden, discover high-acidity white and sparkling wines from hybrid grapes like solaris. South Africa's Hemel-en-Aarde Valley offers exceptional Pinot Noir and rustic charm, while Goriška Brda in Slovenia, the "Tuscany of Slovenia," blends medieval charm with innovative winemaking. These regions offer rich cultural and historical experiences, making them must-visit destinations for wine lovers​.