English tour guides share their enthusiasm for enjoying the riot of color and inspiration you'll find in England's best country gardens. Then author Catie Marron explains how she designed and planted a garden as a way to feel a sense of belonging in her new home. And physicist Alan Lightman explains why it's healthy to give yourself a little unstructured time every day just for goofing off.

Scottish tour guides tell us about the most famous castles in a country that's brimming with the imposing structures. Then a Santiago-based American travel writer embarks on a 1,200-mile odyssey through one of the driest places on earth — Chile's Atacama Desert — as he searches for a deeper understanding of his adopted homeland. And listeners call in to share stories and find inspiration for their next travel adventures.

Journalist Oneika Raymond reveals the top countries where, as a black woman traveling solo, she feels a cultural appreciation and connection. Then the head of Bread for the World describes how the organization's advocacy work has stepped up its efforts in the face of cuts to government aid programs. And tour guides from Poland give us a look at how the country is modernizing, while retaining what makes it uniquely Polish.

A travel writer shares how a trip to Antarctica helped him see that continent through the eyes of the early polar explorers. Then a reporter focused on climate change and conservation explains how some North American tree species are migrating to survive the planet's rising temperatures. And two Italy-based tour guides take us to the resort lakes of northern Italy, where the glamour extends beyond the natural scenery.

Learn about the customs that Greeks observe as Orthodox Easter draws near. Then contemplate the massive undertaking of building a cathedral centuries ago and how these monuments to faith and devotion helped shape their locales. And get acquainted with southern Spain's elaborate Semana Santa observances, which fill the streets of Andalucía in the week leading up to Easter.

Hear from tour guides about Spain's robust high-speed rail network and all the places it can take you. Then hit the road vicariously with Pulitzer Prize-winning journalist Nicholas Kristof for a taste of life as a foreign correspondent. And take a closer look at the surprising and fascinating ways in which borders have shaped our world.

Rick marks 20 years of his radio show by revisiting some memorable guests and what they've taught us about travel. Then author Paul Theroux celebrates his 84th birthday as he contemplates the passage of time in his new short-story collection, "The Vanishing Point." And actor Martin Sheen describes how his experiences filming overseas have come to influence his political activism.

Europe brims with world-class art, and we contemplate some of the continent's truly outstanding paintings, sculptures, and historic edifices. Then we learn about the historic and ecological importance of the Gulf of Mexico from a professor in neighboring Florida. And we consider the humble guidebook and what its pages can tell us, both in the moment and long after the trip is done.

A tour guide from Greece delves into the importance of food, family, and traditions in his homeland. Then a Francophile offers advice on how to take on the vast collection of the world's largest — and arguably greatest — museum. And guidebook researcher Cameron Hewitt shares discoveries from his travels in the Balkans, an affordable and rewarding alternative to the tourist crowds of western Europe.

Two countrymen explore Ireland's reverence for their national poet, W. B. Yeats. Then a Dublin journalist shares what it was like to grow up amid the turbulent societal changes in his city during the 1960s and '70s. And a guide from Belfast tells us why an Emerald Isle itinerary should include a visit to Northern Ireland.