#1 Steep, rugged ocean cliffs extending in an island chain.

Channel Islands National Park

CA · 263K visitors/yr

Comfortable

California's Galápagos lies 12 miles offshore with 145 endemic species. Sea lions, island foxes, and rare seabirds inhabit five islands.

#2 sun rising over the New River Gorge

New River Gorge National Park & Preserve

WV · 1.8M visitors/yr

Busy

The East Coast's deepest river gorge cuts 1,000 feet through ancient rock, with Class V rapids and 100 miles of trails above.

#3 Black Canyon near Tomichi Point

Black Canyon Of The Gunnison National Park

CO · 336K visitors/yr

Moderate Crowds

Gunnison River carved North America's steepest gorge through 1.7-billion-year-old rock, with 2,000-foot walls that trap the sun.

#4 a broad stone arch with rock pinnacles in the distance

Canyonlands National Park

UT · 818K visitors/yr

Moderate Crowds

Four districts carved by the Colorado River—from Island in the Sky's overlooks to The Maze's backcountry spanning canyons larger than LA.

#5 View of the Congaree River during the Fall

Congaree National Park

SC · 242K visitors/yr

Moderate Crowds

The largest old-growth bottomland hardwood forest in the Southeast protects champion trees you'll reach via elevated boardwalk.

#6 The canyon glows orange as people visit Mather Point, a rock outcropping that juts into Grand Canyon

Grand Canyon National Park

AZ · 4.9M visitors/yr

Moderate Crowds

The Colorado River carved through two billion years of rock to create a chasm one mile deep and 277 miles long at the South Rim.

#7 Blooming Cenizo

Big Bend National Park

TX · 561K visitors/yr

Comfortable

Big Bend protects 1,200 square miles where the Chisos Mountains rise from desert. Over 450 bird species recorded—more than any park.

#8 Coral reef with two snorkelers diving below the surface

Biscayne National Park

FL · 512K visitors/yr

Busy

Miami's skyline floats on the horizon while you snorkel over the continental United States' only living coral reef system.

#9 Cruising Glacier Bay

Glacier Bay National Park & Preserve

AK · 736K visitors/yr

Moderate Crowds

Fifteen tidewater glaciers calve into a 65-mile fjord where humpback whales surface within camera range, reachable only by boat or plane.

#10 A cascade of water pours over a rock ledge. Green foliage is in the background.

Mammoth Cave National Park

KY · 747K visitors/yr

Moderate Crowds

The world's longest cave system—over 400 miles mapped—lies beneath Kentucky's limestone plateau, explored for over 200 years.