#1 The Gateway Arch and Old Courthouse with a row of pink blooming cherry trees in front

Gateway Arch National Park

MO · 3.0M visitors/yr

Busy

Gateway Arch National Park is 0.14 square miles of westward expansion history beneath a 630-foot steel monument with three million visitors.

#2 A pink sky above gentle white buildings

Hot Springs National Park

AR · 2.5M visitors/yr

Very Crowded

Hot Springs' 143-degree thermal water flows through historic bathhouses where health seekers once shared sidewalks with gangsters.

#3 People in bright orange kayaks paddle around a bend in a river, past green trees and a rocky shore.

Cuyahoga Valley National Park

OH · 2.9M visitors/yr

Moderate Crowds

The Ohio & Erie Canal towpath runs 20 miles along the Cuyahoga River, past 65-foot Brandywine Falls and glacial rock ledges.

#4 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.

#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 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.

#7 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.

#8 Michigan Lake beach with green grassy dunes in the background, under a blue sky.

Indiana Dunes National Park

IN · 2.7M visitors/yr

Very Crowded

Lake Michigan's wind built these dunes into the park system's highest plant biodiversity—over 1,100 species on 15 miles of Indiana shore.

#9 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.

#10 Rocky coastline with palm trees and a cliff beyon

Hawaiʻi Volcanoes National Park

HI · 1.4M visitors/yr

Moderate Crowds

Two active volcanoes shape terrain from tide pools to alpine desert. Walk across recent lava flows and through rainforests on ancient rock.