This show goes to great depths: A diving enthusiast highlights the underwater world, from the turquoise coasts of Central America to the cold jade waters of Puget Sound. Then NPR's Steve Inskeep explains what Karachi showed him about the world's mushrooming mega-cities. And author Scott Wallace describes his trek deep into the Amazon, and the efforts to protect the fierce Arrow people from contact with the outside world.

To mark the centenary of the start of World War I, we'll hear how the British are remembering the Great War, and what's afoot in London this year, where WWI sites, events, and memorials make good on the British promise to "never forget." Then we'll visit the areas of the former Yugoslavia, where the war started, to hear what it's like today. We'll also get a taste of the best regional foods you can enjoy on a road trip across the Southern US, from "Road Food" specialists Jane and Michael Stern.

Get tips for enjoying the scenic fjord country of Norway, currently celebrating its 200 years as a nation. Then listen in as we chat about what makes the tiny Riviera principality of Monaco sparkle, and listeners share tales of faux pas they committed while traveling abroad.

Do a little vicarious traveling for Mother's Day: Listen in as American author Jennifer Wilson describes her experience of relocating her family to the same Croatian village that her great-grandparents had emigrated from. Then, an American who married a Frenchman explains what it's like to raise a child in Paris, and friends from Sicily discuss how their mammas have taken center stage throughout their kids' lives. And Rick shares how his own mother influenced him to become a traveler.

Join us for a generous dose of convivial banter about Scotland: We'll hear all about this year's Scottish "Homecoming," then get insider tips for enjoying Edinburgh and Glasgow, and exploring the Scotland's borderlands, Highlands, and islands. Plus, folk singer Jim Malcolm shares some of the poetry embedded in the traditional music that so evocatively reflects the history and character of his fellow Scots.

Enjoy Mexico and the Netherlands like you're one of the family: The authors of "The People's Guide to Mexico" share tips for making your next trip south of the border extra-fun and culturally rewarding. Then we'll look into family-friendly cultural treats in the Netherlands, including Europe's guilty TV pleasure, the annual Eurovision Song Contest.

Listen in as we chat about experiencing impressive site-specific art in the Americas, then learn about endangered heritage sites in Latin America and Iberia. We'll also explore some quiet "sacred places" scattered across New Mexico’s dramatic landscapes.

Learn how Ireland is displaying its connections with the infamous Titanic — in Belfast, where it was built, and in County Cork, its final port of call. We'll also explore the historic synagogues and neighborhoods of Prague, once home to Europe's largest Jewish population. And we'll meet a woman who's been helping former enemies make peace in a number of the world's hot spots.

British actress and global traveler Joanna Lumley tells Rick why her family is revered in Bhutan, then Spanish tour guides describe the highlights of their country's spiritual capital, Toledo. Plus, guidebook author Trish Clark shares tips for finding an affordable room and a good breakfast in Europe's convents and monasteries.