THE border between the Czech Republic and Austria was less than a mile away, when an old man mysteriously appeared in the middle of the leafy one-lane road. A generation ago, he might have been shot for being this close to the former buffer zone of the Iron Curtain. “Dobry den,” I said, wishing him a “good day.” But he just stood there in frozen silence, a you're-not-from-these-parts look on his face. So I soldiered on, merrily continuing on my scenic hike through the Bohemian woods. During the Cold War, this slice of Central Europe was verboten to anyone but residents of a few ancient villages and the guards patrolling the frontier. The Czechoslovak government cleared the buffer zone of locals and populated it with card-carrying members of the Communist Party. That might explain why, two decades after the Berlin Wall fell, a haunted stillness hung over this coniferous landscape of low-rolling hills. It is also a reason the network of hiking and biking trails in those hills of southern Bohemia remain among the Continent's most pristine and untrammeled. The Czechs are also a nation of prolific hikers. Etched throughout this Central European country are nearly 24,000 miles of color-coded hiking trails, stretching from Karlovy Vary in the northwest to Ostrava in the east. Much of it is maintained by the Czech Hiking Club, a private organization, dating back to 1889, that splashes painted trail markers across trees and installs signposts. With so many trails to explore, how does a non-Czech hiker choose the right route? For my wife, Jessie, and I, the answer was simple. We would spend five days walking trails of the Czech Greenways, a network of old trading routes that were recently restored by the Friends of Czech Greenways, a nonprofit group based in Brooklyn. The network, also called the Prague-Vienna Greenways, is the brainchild of Lubomir Chmelar, a retired architect who splits his time between New York City and Mikulov, a small southeastern town near the Austrian border. He was inspired by the Hudson River Valley Greenway, a revitalization project in New York that has spurred recreation and culture along the riverfront from Westchester County to Albany. Chmelar assembled a team of landscape architects and Harvard M.B.A'.s and set off on foot to find the most scenic route between Prague and Vienna. The result is a 250-mile-long (400 km) network of trails, zigzagging between the two European capitals past ruined castles, cute villages, dense forests and the once-forbidden Cold War border. A few weeks before my hike, I met up with Chmelar, 73, at his Manhattan town house, hoping that he'd help me decide which section of the greenway I should hike. Chmelar, a tall and dapper man who spoke with an Oxford-educated accent, excitedly threw out numerous itineraries. Eventually, we settled on my jaunt: we'd start halfway between the two capitals, in the picturesque, Unesco-protected southwestern town of Cesky Krumlov, and head east and northeast about 80 miles (about 13 km) to the medieval town of Slavonice, about a mile from the Austrian border. The hike offered a mix of gorgeous Baroque towns, varied terrain and a dose of history in a part of the country that tourists rarely see. Chmelar offered a little history lesson himself. Under Communism, he said, even hiking was politicized. “The government preferred keeping people in the club,” he said, “not deep in the forest where they don't know what they're up to.” We set out in mid-May, on a cold morning when the majestic castle of Cesky Krumlov cast a long shadow over the town's quiet cobblestone streets. My wife and I slung on our medium-size backpacks, filled with two-days' worth of clothes, bandages (for blisters) and several detailed maps of south Bohemia. Then we boarded a bus. Although we would cover most the trail by foot, the cheap and efficient Czech bus system also meant we could hop on buses to keep the daily hikes under 25 miles. The idea would be to hit the trail early in the morning, so we could arrive at our destination for a late lunch and spend the remainder of the day sightseeing. The bus took us over the steep surrounding hills and deposited us 15 miles (24 km) away in Kaplice, a tiny town at the foot of the Novohradske mountains. We found a red-and-white-striped trail marker in the town's center that lead us up a dirt path. Within minutes, we were hiking through dense pine forests and skirting yellow-poppy-filled prairies, so bright and expansive that it almost gave me vertigo. About five hours and eight miles later, we entered Benesov nad Cernou, a village that was little more than a square with a yellow-and-white church at one end. That night, we dined on svickova (roasted tenderloin slathered in gravy and topped with a dollop of cream and cranberries) while mustached men chain-smoked and screamed at a televised soccer match. The next couple of days took us through wildly diverse terrain that included two 2,600-foot-high mountains and an English-style park dotted with oak trees and empty fortresses. In Nove Hrady, a hilltop town with a leafy main square, we slept in a monastery once used to house guards who patrolled the border. We strode through sleepy villages where the only sound was the echo of a soccer ball, bouncing off a stone wall. Fortunately, Trebon, where we spent our third night, was more dynamic. This town of nearly 9,000 people was the perfect rest stop after a trek of some 22 miles (about 33 km) through swamps, pine forests and deer-filled prairies. The town has a small castle, an irregularly shaped square flanked by colorful Baroque apartment houses, a spa and a warren of winding lanes — all encircled by thick walls. We spent the rest of the day exploring another of Trebon's oddities. Just outside the town walls were artificial lakes teeming with carp. Some people call carp river scum; the good people of Trebon, however, call them dinner. We ended up at Supinka, a surprisingly chic restaurant that serves carp in just about every conceivable way: fried, pan-seared, and poached; sprinkled with paprika, marinated in soy sauce, drenched in chili or topped with garlic sauce. This was hardly the hike I expected. Instead of overdosing on bad Czech grub, getting lost in the woods and maybe even encountering a bear, everything had gone smoothly so far. And just to make sure it continued to go well, we went to bed early. For our final day, we took a bus from Jindrichuv Hradec to Nova Bystrice, about 15 miles (24 km) from our finish line. A black dog trailed us out of Nova Bystrice until we reached the village of Klaster, which is little more than its namesake, a plus-sized white cloister in the middle of a huge meadow. About five miles later, we passed the imposing Landstejn castle then hiked through dense fern-blanketed pine forest. I half expected to see a troll or a gnome. Instead, we came across igloo-like concrete bunkers, many which were camouflaged with dirt and tree branches. These bunkers, it turned out, were built from 1935 to 1938 to guard the Czechoslovak border against an invasion by Hitler. But during the Cold War, the bunkers served the opposite function: to prevent Czechoslovak citizens from escaping to the West. That might explain why the area felt spooky, as if we were trespassing on sacred ground. As we passed the final bunker, the Renaissance-era bell tower of Slavonice came into view. We trudged through a neighborhood of 19th-century houses and through one of Slavonice's medieval stone gates. The tiny town looked like it hadn't changed in two centuries, with triangular-shaped piazzas lined with old Renaissance apartment buildings painted with colorful, comic-strip-like Biblical scenes. Back in the 15th century, Slavonice was a common stopover on the Prague-to-Vienna trade route. Today, it's become a magnet for artists and bohemians from Prague. And, of course, it is also attracting visitors like me, looking for a cheap place to stay and a friendly place in which to rest my feet and after an 80-mile Bohemian hike. __