Get an inside look at the (mostly) friendly rivalries of Scandinavia as a pair of tour guides from Sweden and Norway sit down for a chat. Then hear from a London Blue Badge guide about what to know — and love — about London's famous underground metro system. And listen in as we explore the grand castles of the Czech Republic.

Two tour guides from Sofia explain why Bulgaria is one of Europe's most underrated travel destinations (hint: it has a long, fascinating history — and bargain prices). Author Francine Falk-Allen shares know-how and insights for traveling with a physical disability. And author Richard Cohen describes the varied ways human cultures have long celebrated — and feared — our life-giving nearby star.

Who's afraid of the dark? Adventurer Dan Richards shines a gentle light on what goes on in our world after sunset. Then an Italy tour guide looks beyond the crowds of Florence, Venice, and Rome to share her favorite side trips that are worth the diversion. And a Mexico City guide clues us in on the multicultural neighborhoods and cosmopolitan vibe of his city, the largest metro area in North America and still growing.

A photojournalist lets us in on her favorite European hot springs to visit, from Iceland to Turkey and points in between. And a man who spent seven years traversing the globe on foot — with his faithful pup alongside him — describes how his adventure helped him learn to embrace the now.

Learn about the Ancient Ohio Trail and its cluster of mysterious geometric earthworks left behind by pre-Columbian mound-builder cultures. Then get an inside look at the World Monuments Fund's biennial selection of endangered archaeological and cultural sites, whose preservation is vital to our heritage. And what goes up, must come down: Pilot Mark Vanhoenacker shares the physics, and the magic, of landing an airplane.

Italian food expert Fred Plotkin describes some of the unusual varieties of pasta that you can find in Italy — and the reason behind their different shapes. Historian Jeff Biggers explores the Mediterranean island of Sardinia, where sites dating back to the Bronze Age are found across the island. And tour guides from Tuscany and Sicily bring us the scoop on how to find the best gelato in Italy.

Author Elaine Sciolino gives us the history behind the famous women — both artists and subjects — to visit in Paris' grand repository. Then a Romani author shares what it was like growing up in her culture as we trace the lineage and influence of the vibrant Romani people. And the well-traveled Paul Theroux provides aspiring expats a realistic assessment of what it means to leave the US in the rearview mirror.

Beloved English classics scholar Dame Mary Beard offers wisdom on how to tackle the vast collection of the British Museum, and ponders the ethics and responsibility of retaining the cultural antiquities of other lands. Then a cartoonist shares his love of museums and how they transform us by illustrating memorable moments at his favorites across North America. And a Korean American travel writer explains why Seoul is an ideal introduction to traveling in Asia, and recommends a relaxing island counterpoint to the bustling, 24-hour capital.