A Dutch guide invites us to imagine a day on the water exploring Amsterdam's iconic canals. Then a historian shares what little we know of the elusive Sentinelese — likely the most isolated, least contacted people on earth — and what he learned by traveling to nearby islands in the Bay of Bengal. And a tour guide from Portugal tells us why the venerable university of town of Coimbra is such a delight to explore.

Celebrate Earth Day by considering the ways you can address climate change at home, with practical advice from a scientist who's seen its effects around the world. Then hear from a culinary historian about the crops, farm animals, and agricultural traditions that we risk losing in America. And mark Shakespeare's birthday by learning how his works have played a key role in shaping Africa's newest nation and by getting tips for enjoying a visit to his hometown of Stratford-upon-Avon.

We admire the seafaring prowess of the Polynesians and hear how a cultural faux pas led to Captain James Cook's fateful encounter with 18th-century Hawaiians. Then tour guides from Athens and Thessaloniki recommend attractions to visit in northern Greece, and The New Yorker’s "Comma Queen," Mary Norris, explains what an appreciation for Greek language and mythology can add to your own Greek odyssey.