A wide variety of reasonably priced fresh fish, shellfish, crabs and kalamari for the customers to choose at the Athens Municipal Market, a stop on our Culinary Secrets of Downtown Athens walk.

Our “Culinary Secrets of the Old City” walk goes beyond the major monuments and into the backstreets where all of the serious eating is done. We’ll set off through the atmospheric, lesser-explored market streets around the Egyptian Spice Market and then go deeper into the untouristed Fatih neighborhood.

Dear Culinary Backstreets, I’ve heard about “wet markets,” but what are they exactly? And where can I find the best wet markets in Shanghai? Stocked with all the fresh produce and live seafood that hungry Shanghai residents could ever cook up, wet markets are an essential alternative to the brand-name supermarkets vying for their slice of the market share of the planet’s largest population. These markets are so named because the floor tends to be wet, thanks to the live fish flopping around and the vendors’ habit of throwing water on the ground to keep the area clean. They are, however, under constant pressure from the central government’s drive to urbanize the population and modernize facilities, which has led to the steady destruction of the more traditional ones.

Having been divvied up and overshadowed and even having come back from a nasty fire, the Mercado San Juan Arcos de Belén, also known as San Juan Salto del Agua, has hung on tight as a staple market in Mexico City’s downtown. Born from the 1950s-era split-up of the original San Juan marketplace, which stood only a few blocks away in what is now the Plaza San Juan off of Ayuntamiento, this is a very budget-friendly market in Mexico City’s downtown, largely bereft of high-end delicacies but bustling with mostly working-class families. It is shouldered by two major traffic conduits, Eje Central and Arcos de Belén, and sits atop the two-line intersection of Metro Salto del Agua on the forest-green and pink lines.

We’ve written previously about the immense diversity of Mexican cooking: Every region has unique traditions that build upon ingredients common to much of the country. And yet there are a few regions that stand out for the variety and vividness of the flavors, colors and tastes found there.

In Mexico, the land of eternal spring, something good to eat is always in season. We ravenously await the arrival of artichokes in March, mangos in April, fresh corn in September. Even the wriggly little gusanos de maguey (maguey worms) which appear in May are wildly anticipated – by some. Change in season is subtle here, but essential to the survival of the country. But seasonal lines are blurring. Asparagus rears its tasteless Chilean head all year; pallid strawberries are found in December. Seasons have gone global and our palates suffer for it. Which is all the more reason to pay attention to what’s local now. From July into October, coinciding with our temporada de lluvia, wild mushrooms, spurred on by rain and humidity, hit the markets of central Mexico. Here in the capital, the month of August is high ‘shroom time.

Let’s say you have only two or three days in Rio. You want to experience a little real Brazilian culture and don’t want to restrict yourself to the obvious tourist stops, overhyped bars and restaurants or usual “gringo” nightlife spots. Our recommendation? Spend a night or day – or both, even – at Feira de São Cristóvão.

On recent visits to Madrid, we’ve noticed that a new breed of food market has taken hold of the city’s attention. While the traditional kind with food stalls slowly disappears, vibrant, culture-focused gastromarkets are booming. In addition to great food, they offer a mix of businesses, along with cooking demos, live music, exhibitions – the list goes on. In 2009, the private society El Gastródomo de San Miguel refurbished a beautiful building that was built in 1916 and located very close to Plaza Mayor. It was opened as the “culinary space” Mercado de San Miguel. Though the initial inspiration was Barcelona’s La Boquería, San Miguel is utterly different, with its own colorful, unique personality. The market is dedicated not just to selling quality seasonal foods, but also to allowing visitors to enjoy them in situ, at tables and chairs distributed throughout common areas. They can choose from cod, fresh shellfish and other seafood, various vermuts, pickles and olives, paella, churros, Spanish wines, international beers, delicious Iberian ham and cured sausages and cheeses, ice cream and non-Spanish items, such as pasta or sushi. Unsurprisingly, the concept has been a hit, and other similarly styled markets have since popped up around the city.

In Mexico, magic is all around us. It’s in the architecture, history, way of life – and, of course, the food. The country’s Ministry of Tourism is no stranger to this magic, and in fact, fully grasping its economic possibilities, it created the Pueblos Mágicos program in 2001 to recognize villages that are unique and historically significant. There are now 80 such pueblos mágicos across the country, and one of our favorites is just a short drive away from Mexico City.

The hardest part about dining in Hong Kong is choosing among the overwhelming number of options. It’s one of the most densely populated cities on the planet, with more than 7 million mouths to feed – and many with demanding palates. You can stand on just about any block in the city and find several affordable eateries above, below and across from you (kind of like Starbucks in Seattle).

Spring arrives at the markets in Istanbul with a great deal of color and fanfare. Vendors arrange peas in perfect diagonal rows, displaying their goods to lure you into a multi-kilo purchase. Men furiously carve out artichoke hearts and toss them into lemon-water-filled bags, step around massive piles of trimmings and hand you what feels like a new goldfish purchase. Fava beans are ubiquitous in their fuzzy pods, although less appealing because of all the prep work that comes with them. Best to enjoy fava beans in a restaurant, zeytinyağlı-style (with olive oil) and or in our favorite preparation, a garlicky mash like the chefs make at Müzedechanga in the Sabancı Museum.

Editor’s note: We asked writer Anya von Bremzen where she heads first for food when she arrives in Barcelona. She is the winner of three James Beard awards, a contributing editor at Travel + Leisure and the author of five cookbooks, including the recently published Mastering the Art of Soviet Cooking: A Memoir of Food and Longing.Most Barcelona tapas haunts, old and new, pay homage to the bares de producto, the astounding ingredient-laden kioskos (dining stalls) of the buoyant Boquería market. It might be crowded and touristy but on my first morning in town, Boquería is still my Holy Grail. The best time to go? Around 10:30 a.m., when the stalls are less crowded between lunch and dinner. Right by its entrance, I stop to pay my respects to the legendary chickpea-and-butifarra sausage stew at Pinotxo. Its owner, the venerable Juanito Bayen, is now nearing 80 but looking dapper as ever in his satin vest and bow tie. Juanito is still a maestro of counter banter, spiking coffee with brandy for dour resident fishmongers, plying Japanese tourists with pristine razor clams, smiling for cameras next to Ferran Adrià.

A hidden culinary sanctuary, El Passadís del Pep may be located in one of the most visited quarters of Barcelona, but it’s out of sight of anyone who isn’t looking for it. Once you go down the long corridor that leads to the restaurant, you don’t need to do anything, and that includes choosing what to eat. From the moment you sit down, the “house” offers you your first bottle of cava, and the celebration of food and life begins. There is no menu and there are no “daily specials,” just whatever Joan Manubens and his team decide to cook that day.

Mushroom hunting has an irresistible, magical pull. Composer John Cage, an avid mushroom collector, found them an integral part of his creative process, once writing: “Much can be learned about music by devoting oneself to the mushroom.” Every fall, thousands of Catalans likewise find themselves under the mushroom’s spell, following the elusive fungus’s silent melody into the woods, a rustic wicker basket in one hand and – more and more these days – a GPS-enabled smartphone in the other.

Dear Culinary Backstreets, I’m traveling to Barcelona and I love visiting food markets. I’ve heard a lot about La Boquería, but are there any other markets that might be worth visiting?