Turns out the Chacoan people, like the Romans before them, were crazy about roads. They built more than 200 miles of them, mostly for ceremonial reasons. With the help of a newly released map (aztecchamber.com), visitors can trace the routes, which were once wider than two-lane highways and are often accessible from major byways in the Four Corners. Make sure to take in two of the less frequented sites along the ancient roads. Salmon Ruins, a thousand-year-old Chacoan-style great house that once had 250 rooms, sits on government-owned land near Aztec, New Mexico ($3; salmonruins.com). Nearby lies perhaps the most isolated community: Twin Angels Pueblo, a 17-room complex perched precariously on the edge of a canyon. This year, the Aztec Visitors Center marked this remote site on a map for the first time, though few people hike the half mile to view it. It may be the perfect place to ponder the secrets of the ancients: sitting on the edge of Kutz Canyon, next to a centuries-old masonry wall, with expansive views over sagebrush country.