Novelist and MIT physics professor Alan Lightman describes how a little time alone with Maine's night sky illuminated his awareness of the universe, and his place in it. Then listeners share stories of inspiring travel experiences, before we welcome the new year with a toast to Champagne — both the bubbly and its French region of origin.

We'll look at what makes the cozy Christmas markets of Germanic Europe so treasured. Then we'll hear about special Christmastime traditions from around Europe, including Spain, Sicily, Ireland, and Scotland's Hebrides Islands.

Food writers Jane and Michael Stern discuss wintertime comfort grub served in America's roadside restaurants, then culinary-culture expert Fred Plotkin explores the various kinds of chocolate available across Europe. And listeners share the experiences that made their Christmas vacations in Europe really special — plus a tour guide from Prague describes the traditions that at the heart of a cozy Czech Christmas.

An expert on Antoni Gaudí reveals what the Modernista architect had envisioned for Barcelona's magnificent Sagrada Família church, and shares updates on the work to complete what Gaudí started 135 years ago. And travel writer Seth Kugel makes the case for letting serendipity play a role in your trip's itinerary.

A Greece-based tour guide describes the elevated role of godparents in her adopted country, where godparents become a lifelong part of the child's family. Then TV chef Lidia Bastianich shares the story of her family's flight from Yugoslavia, and the successful family business they were able to start in America. And former NBC Middle East correspondent Martin Fletcher explains how his latest novel, set in Israel during its early years as a modern state, evokes the extraordinary drama of Israeli life in that era.

Pulitzer Prize-winning poet Peter Balakian describes the new positive spirit he encountered during his recent travels in Armenia, whose citizens have earned good reason to feel upbeat about their future. And composer Paul Kildea explains how Frederic Chopin's sublime 24 Preludes — written on a clunky mini-piano in an abandoned monastery in the middle of the Mediterranean — changed how the world hears music.

Find out what made Bulgaria one of Europe's most interesting places to eat. Food writer David McAninch reveals what makes the culinary traditions of Gascony tastier than in the rest of France. Plus, discover what Italians expect in a good olive oil.

Get insider advice for enjoying the less-visited corners of the Balkan Peninsula, from Bosnia's atmospheric mosques to Montenegro's scenic coast. And as we mark the centennial of the "Great War," hear about the most compelling places in Europe to learn about American soldiers' contributions to World War I. Plus, listen in as tour guides share their tips for enjoying Kraków, the cultural and spiritual capital of Poland.

A New York Times travel writer recommends four great cities for solo travelers, and the best time of year to visit them. Then the author of "Achtung Baby" tells us of her family's relocation to Berlin, and what she learned about Germans' hands-off approach to child rearing. And listeners share their travel plans and experiences for trips to Turkey, Hungary, and Sicily.

Author Jim Hinckley joins us to recommend Old West ghost towns that you can still visit. Then Irish singer Cathie Ryan describes how Ireland remembers its heroes through the lyrics of traditional songs. And journalist Carl Hoffman shares his deeply researched take on the mysterious disappearance of banking scion Michael Rockefeller in the jungles of New Guinea.