Mistakenly believing that it's hard to reach, many Americans fail to visit the greatest human monument in all the nation, chiseled into the Black Hills of South Dakota. It's called Mount Rushmore National Memorial, and (for Americans) it's on a par-artistically and emotionally-with the Great Wall and the Taj Mahal. It's also only one of many wonders in the southwest corner of the state. They include the otherworldly rock formations of Badlands National Park, the burgeoning bison herds at Custer State Park, the dramatic Native American history and culture at Pine Ridge Indian Reservation, and the Crazy Horse Monument-the world's largest sculpture in the making.

There couldn't be a better time to visit these grand landmarks, in an area of the country where lodging, food, and sightseeing costs are among our nation's least expensive. A Swift Visit to Rapid City Though Sioux Falls is the state's largest town (and airport), you are much better situated for the drive we suggest by beginning the trip in Rapid City, five-and-a-half hours to the west (and thus much nearer to The Badlands and Mount Rushmore). Delta, Northwest, and United Express all fly into the quiet Rapid City Airport (usually via Denver), with United Express tending to be the cheapest of the three. Low-cost car-rental companies at the airport include Thrifty, Budget, and National.

Most tourists on their way to Mount Rushmore speed through Rapid City without stopping, but this neat, clean, and historic town is worth at least a full day's exploration. With well-tended gardens, historical signs everywhere, and interesting shops and restaurants, the city is a standout. And the downtown landmark you won't want to miss is the Hotel Alex Johnson (523 Sixth St., 605/342-1210, www.alexjohnson.com), a 75-year-old, ten-story tower with chalet motifs that somehow fit in. Pick up a walking-tour brochure that describes the property's ornate lobby, woodwork, chandeliers, and artwork. And why not stay here your first night? Doubles start at just $59 in winter, $89 in summer. If it's full, try the modern Microtel Inn & Suites (1740 Rapp St., 605/348-2523, www.microtelinn.com), where rooms start as low as $57 in winter, $82 in summer.

Take time to see the rest of the downtown, with its boutiques, Indian arts stores, and western shops. One store not to miss is Prairie Edge (606 Main St., 800/541-2388), which showcases remarkable Native American arts and artifacts like drums, pipes, jewelry, herbs, and clothing; it's free and interesting to browse, even if you don't buy a thing. Then have lunch or dinner around the corner at the Firehouse Brewing Co. (610 Main St., 605/348-1915), housed in a former old-time, brick fire station whose huge meals-like Hyperventilation Wings and Rings of Fire Fightin' Nachos-sell for only $7.95. You'll see real-life cowboys with Stetsons and tight jeans stuffed into their boots, sauntering about just like in olden times.

Even if you don't stay in Rapid City, stop by the Journey Museum (222 New York St., 605/394-6923, www.journeymuseum.org; $6) before heading on. Recently opened amid much controversy (it went way over budget and is in an awkward, hard-to-find location), the collection here is nothing short of first-class, with all kinds of multimedia and interactive displays on Native American culture and history-everything you'd want to know about South Dakota history, geology, and mythology.

Good times in the Badlands

Now, from Rapid City, head east along Interstate 90 for roughly 60 miles to the famous town of Wall. With billboards and signs for Wall Drug (which began by giving away ice water for travelers during the Depression) stretching from here to the South Pole, the town has become a running joke for cross-country motorists. The actual Wall Drug store (605/279-2175, www.walldrug.com) is a huge souvenir emporium taking up more than one building, offering mostly tacky but fun ashtrays, mugs, and fake bows and arrows, as well as singing mannequins and historical photos of Sitting Bull, Red Cloud, and Annie Oakley. If you're hungry, Cactus Cafe & Lounge (519 Main St., 605/279-2561) in downtown Wall serves up Mexican food, steaks, and seafood in a down-home atmosphere for rarely more than $10.

From Wall, head south on 240 until you reach the Pinnacles Entrance to Badlands National Park. The $10 car entrance fee is good for seven days ($5 for cyclists or hikers), and you'll want to spend at least two days at this magical outdoor U.S. attraction, rich in visuals and atmosphere.

How did the Badlands get their name?

The French Canadian fur trappers called them les mauvais terres ... traverser, or the "bad lands to travel across." The Native Americans' name for them, mako sica, also meant "bad lands." The reference captured the imagination of the American pioneers who had to traverse this unrelenting terrain in the 1800s. Named a national monument in 1939 and a full-fledged national park in 1978, Badlands, with its rock spires of different hues, is a mystical experience for intrepid domestic travelers. It's a place of intense history and controversy, which continues as Native Americans keep fighting for their land rights in this unforgiving land. Recent sit-in protests by activists postponed the digging up of ancient graves at Stronghold Table, a sacred area claimed by both the Lakota Nation and the National Park Service.

With pointed, jagged peaks made from water-sculpted, crumbling rock, stark canyons in yellow and red tones, and frequent thunderstorms (legend says caused by the mythical Thunder Birds) creating a dramatic purple backdrop, it's amazing it took so long for the beauty of this area to be appreciated and accepted on its own terms. The Badlands lie 62 miles east of Rapid City, on I-90. Turning west on Creek Rim Road after the Pinnacles Entrance, you'll begin to witness the distinct badland formations and see some of the last virgin prairie land in the U.S. Five miles west from the entrance is Roberts Prairie Dog Town filled with mounds of earth dotted with peeking little heads of dogs. A vital member of the ecosystem due to their soil churning, the irresistibly cute prairie canines are endangered by ranchers who would rather see them all gone. Their natural predator, the black-footed ferret, once thought extinct, is still unusually rare. Badlands is one of the few places left to see such amazing creatures.

The one main road east through the park is the Badlands Loop Road, which takes you through most of the park's natural wonders. A must-do is a hike along the Castle Trail near the Interior Entrance to the park. The Mars-like terrain will seem like the setting for a science fiction movie. Ranger talks are free during the summer, on topics ranging from fossils to prairie dogs. More information: 605/433-5361, www.nps.gov/badl.