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HAWAII: Marvel at the extreme landscapes and steaming vents at Hawai'i Volcanoes National Park, home to two active volcanoes.
IDAHO: Explore Craters of the Moon National Monument and Preserve, which encompasses three major lava fields and has the deepest known open rift crack in the world at 800 feet.
ILLINOIS: Hop the "L" to Millennium Park in downtown Chicago, which features modern architecture and public art, like "Cloud Gate," a giant bean-like sculpture that reflects the city's skyline.
INDIANA: Cheer on the racers at the Indy 500, an annual race at the Indianapolis Motor Speedway that is one of the most prestigious events in car racing.
IOWA: See the filming location of the 1989 classic "Field of Dreams" in Dubuque County, Iowa. You can bat on the field or take a guided tour of the surrounding farm.
KANSAS: Step inside a functioning salt mine at Strataca, the only US salt mine that's accessible to visitors. Ride a tram through the underground caverns and learn about one of the world's largest deposits of salt rock.
KENTUCKY: Don your finest hat at the Kentucky Derby, held at the famous Churchill Downs thoroughbred horse racing track in Louisville each year.
LOUISIANA: Stroll through the French Quarter, the oldest neighborhood in New Orleans. Bourbon Street sits within its limits and is known for its nightlife and Mardi Gras festivities.
MAINE: Take a hike in Acadia National Park, the oldest National Park east of the Mississippi River. It encompasses Mount Desert Island and a handful of smaller islands off the Atlantic coast.
MARYLAND: Observe the wild horses of Assateague Island, which roam the island freely. Visitors to the island can also kayak and relax on the National Seashore.
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MASSACHUSETTS: Go back in time at the Witch House in Salem, where Judge Jonathan Corwin lived in 1675. It's the last original building with direct ties to the Salem witch trials of 1692.
MICHIGAN: Relive America's industrial history at the Henry Ford Museum in Dearborn. The 12-acre site houses an incredible collection of Americana, including antique machinery, automobiles, locomotives, and other pop culture-related items.
MINNESOTA: Walk across the Mississippi River at Itasca State Park, where the headwaters of the river are located, along with more than 100 lakes.
MISSISSIPPI: Kick back at the Gulf Islands National Seashore, a protected region along the Gulf Coast where visitors can camp and enjoy the sandy white beaches.
MISSOURI: Gawk at St. Louis' Gateway Arch, the tallest man-made monument in the US. The stainless steel arch commemorates the westward expansion of America and stands 630 feet tall.
MONTANA: Hike on 700 miles of trails at Glacier National Park, which was home to around 150 glaciers in 1850, a figure that has shrunk to just 25 today.
NEBRASKA: Admire Chimney Rock, a geological formation that served as a landmark along the Oregon Trail, the California Trail, and the Mormon Trail during the mid-19th century.
NEVADA: Cruise the 4.2-mile Las Vegas Strip, home to many of the largest hotels and casinos in the country.
NEW HAMPSHIRE: Explore the historic seaport of Portsmouth and visit the Portsmouth Harbor Light, one of 11 U.S. lighthouses established before the American Revolution.
NEW JERSEY: Amble through Grounds for Sculpture, an outdoor sculpture garden with more than 275 works, which currently include Seward Johnson's 26-foot-high "Forever Marilyn."