Mugaritz
This bucolic farmhouse in the hills above Errenteria, 8 km (5 miles) northeast of San Sebastián, is a veritable laboratory of modern cooking techniques helmed by (arguably) the most experimental chef in Spain today, Andoni Aduriz. The obligatory three-hour, 23-course experience is unabashedly abstract with dishes like "don't search, find" and "tradition: onion and squid," all complemented by zany wild-card wines. The current menu, announced in April 2022, was created in tandem with a Basque filmmaker, a writer, and an illustrator.