#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 A sunset creates a silhouette of a cypress tree with needle-like leaves that is shaped like an 'N'.

Everglades National Park

FL · 742K visitors/yr

Comfortable

America's largest subtropical wilderness—a slow-moving river creating sawgrass marshes, mangrove islands, and alligator habitat.

#3 Brilliant blues and greens of a hot spring ringed by oranges, yellows, reds, and browns.

Yellowstone National Park

ID, MT, WY · 4.7M visitors/yr

Comfortable

The world's first national park sits on a supervolcano where half of Earth's geysers erupt on schedule and bison herds cross roads freely.

#4 A thick layer of frost covers the fields, trees, and mountains in Cades Cove.

Great Smoky Mountains National Park

NC, TN · 12.2M visitors/yr

Busy

America's most-visited park offers 850 miles of trails, historic farmsteads in Cades Cove, and the continent's salamander capital.

#5 Photo of Giant Dome and Twin Domes in the Big Room.

Carlsbad Caverns National Park

NM · 460K visitors/yr

Moderate Crowds

A 600-foot limestone cavern beneath the Chihuahuan Desert, carved by sulfuric acid rather than water, where 400,000 bats spiral out at dusk.

#6 El Capitan with blooming claret cup cacti

Guadalupe Mountains National Park

TX · 226K visitors/yr

Comfortable

Texas's highest peaks rise from a 265-million-year-old fossil reef in the Chihuahuan Desert, holding more species than any Texas park.

#7 A few of the stars at night with a view of Fort Jefferson.

Dry Tortugas National Park

FL · 84,873 visitors/yr

Busy

Seven coral islands 70 miles west of Key West, anchored by Fort Jefferson—a massive 19th-century fort that was never finished or fired upon.

#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 A colorfully striped butte in the foreground overlooks a dark green badlands landscape

Theodore Roosevelt National Park

ND · 733K visitors/yr

Busy

Roosevelt's badlands preserve eroded buttes, wild bison, and the solitude that turned a politician into America's conservation president.

#10 Boulders in the Balconies Cave.

Pinnacles National Park

CA · 354K visitors/yr

Moderate Crowds

Volcanic spires rise above talus caves where you can crawl through darkness on designated routes. Half of Yosemite's crowds.