Koutsoyannopoulos Winery (Volcan Wines) ★ 4.4
Koutsoyannopoulos family canava at Vothonas (between Fira and Kamari), founded 1870 and operating since the 1990s with the on-site Wine Museum, an 8-room cave display covering 300 years of Santorini viticulture.
Tasting: Daily year-round; the visit combines the working winery, the underground Wine Museum (an 8-room cave tracing 300 years of Santorini wine history), and a tasting flight of the estate's Volcan Wines bottlings.
Signature wines: volcan-wines-assyrtiko, volcan-wines-nykteri, volcan-wines-vinsanto
Tip: The cave Wine Museum is the most child-friendly wine attraction on Santorini and one of the few rainy-day options on the island; the tasting flight afterwards is solid value.