It seems the nation is filled with more and more happy campers.

At many of the nation’s national parks and monuments, attendance hit record levels in 2015, and parks are bracing for even more crowds in 2016, when the National Parks Service turns 100 years old.

Overall visitation to parks, sites and monuments run by the National Parks Service is on track to hit 300 million in 2015, topping last year’s all-time high of nearly 293 million.

Blue Ridge Parkway, America’s longest linear park that runs along part of the Appalachian Mountains, welcomed the most visitors in 2015 — 14,184,645 people. It’s consistently the most-visited site in the National Park System, closely followed by the Golden Gate National Recreation Area, which includes San Francisco’s Golden Gate Bridge and which welcomed 13,851,213 visitors in 2015.

For nature seekers who flock to national parks to escape the crowds of urban settings, record-breaking attendance might be good news in theory, but isn’t so great when lined up at the entrance gate. The most popular parks found new ways to manage crowds in 2015 (Yosemite, for instance, lowered entrance fees during off-peak times of year). In 2016, some plan to hire more seasonal workers and volunteers, or direct visitors to less busy areas, according to the Associated Press.

Here are the 12 national parks that saw the biggest attendance spikes in percentage terms during the first 11 months of 2015, compared with the first 11 months of 2014, according to the National Parks Service. Some of the most famous American parks are on the list, but also some lesser known ones that are quickly gaining in popularity. If you want to get in ahead of the crowds, consider embracing the moment and crossing some of these off your bucket list now.

Carlsbad Caverns Shutterstock.com

12. Carlsbad Caverns National Park, New Mexico

In 2015 through November, attendance at Carlsbad Caverns in the Guadalupe Mountains in southeastern New Mexico was 428,655, nearly 15% higher than the same period in 2014.

The park is famous for its caves — it contains more than 119 limestone caves, the most famous of which is the eponymous Carlsbad Cavern. The park’s website says it “offers a rare glimpse of the underground worlds preserved under the desert above.”

Visitors explore The Narrows along the Virgin River in Zion National Park. Getty Images

11. Zion National Park, Utah

Utah’s first national park and one of the state’s biggest tourist attractions saw 3,551,343 visitors in 2015 — 15% more than in 2014.

The Narrows is the narrowest section of Zion Canyon, and one of the most popular areas in the park. To actually hike The Narrows means an all-day adventure walking in the Virgin River and involves some wading upstream.

Crater Lake Shutterstock.com

10. Crater Lake National Park, Oregon

Attendance at Crater Lake in 2015 was 612,142, which is 16.5% higher than the previous year.

Crater Lake is the deepest lake in the U.S. and the seventh-deepest in the world, going all the way from an average surface elevation of 6,178 feet above sea level to a maximum depth of 1,949 feet. It is known to be one of the most clear lakes in the world.

Getty Images

9. Grand Canyon, Arizona

The Grand Canyon is perhaps the most famous of American parks, and was the second most highly visited national park in 2015, with 5,244,594 visitors. That’s about 16.5% more than in 2014.

It’s the 15th oldest national park and was named a Unesco World Heritage site in 1979.

Yellowstone National Park AFP/Getty Images

8. Yellowstone National Park, Wyoming

Yellowstone saw nearly 17% more visitors in 2015 than in 2014, with a yearly attendance of 4,077,241.

The park was established in 1872 as America’s first national park, to preserve the area’s geysers. The most famous Yellowstone geyser is Old Faithful, and the majority of the world’s geysers are in Yellowstone. The park is home to grizzly bears, wolves, and herds of bison and elk, and its website says it is “the core of one of the last, nearly intact ecosystems in the Earth’s temperate zone.”

Mountain bikers explored the rock formations in the Island in the Sky area of Canyonlands. Getty Images

7. Canyonlands National Park, Utah

Canyonlands was visited by 624,279 people in 2015, far less than Utah’s most popular park Zion — but nearly 17% more than 2014’s attendance.

The area known as Island in the Sky is the park’s most accessible district, offering stunning views from sandstone cliffs that stand 1,000 feet high.

Capitol Reef National Park Shutterstock.com

6. Capitol Reef National Park, Utah

In the heart of Utah’s red rock country, Capitol Reef is growing in popularity — it saw 930,161 visitors in 2015, 20% more than in 2014.

The area was named for white rock domes that look like the U.S. Capitol building and rocky ridges that look like marine reefs. Utah’s tourism website calls the park “a 100-mile pinch in the earth’s crust in the geographical middle of nowhere... overloaded with geological, cultural and sensory consequence.”

The Trail Ridge Road in Rocky Mountain National Park. Getty Images

5. Rocky Mountain National Park, Colorado

The Rocky Mountain park saw 4,062,132 guests in 2015, 21% more than in 2014.

It includes some of the highest mountains in the continental U.S. — its Trail Ridge Road crests over 12,000 feet. In what could also be read as a visitor warning, its website says, “iconic summer thunderstorms and persistent winter winds are among the forces that continue to shape this majestic landscape.”

Redwood National Park Shutterstock.com

4. Redwood National Park, California

In Northern California, Redwood National Park saw 496,304 visitors in 2015. That’s far less than the 1 million people who visited the more centrally located redwood forest preserved in the Muir Woods national monument just north of San Francisco, but it’s still 21% more than in 2014.

Redwood is a tree lover’s paradise, home to some of the most massive trees on the planet.

Bryce Canyon in Bryce Canyon National Park. Getty Images

3. Bryce Canyon National Park, Utah

Of all Utah’s national parks, Bryce saw the biggest percentage jump in attendance in 2015 — 1,711,436 people came through its entrance gates, which is nearly 22% more than in 2014.

Bryce claims it is home to the largest collection of “hoodoos” (odd-shaped pillars of rock left standing from the forces of erosion) in the world. Visitors descend on the park’s many overlooks at sunup and sundown for awe-inspiring views.

Isle Royale National Park Shutterstock.com

2. Isle Royale National Park, Michigan

Surrounded by Lake Superior, Isle Royale is far off the beaten path and is said to offer “unparalleled solitude” — indeed, only 18,636 people visited in 2015. But that’s 28% more than in 2014, indicating the park is gaining in popularity quickly.

And the park claims that, based on wilderness land area, Isle Royale’s wilderness is actually the most densely used of all of the national parks.

One reason attendance figures are low is that the park closes annually from Nov. 1 through April 15. Another is that getting there isn’t easy: visitors must arrive by boat or seaplane. The island is sandwiched between Michigan’s Upper Peninsula and Canada, with Minnesota to the west.

Drought took a toll on Joshua Tree National Park in 2015, but attendance was higher than ever. AFP/Getty Images

1. Joshua Tree National Park, California

In the California desert, Joshua Tree saw a record number of visitors in 2014, and then blew right by that number in 2015. As of the end of November, attendance was 1,827,506, 30% higher than the same period in 2014.

The park has since hit 2 million visitors this year. The increase in tourism and crowds is helping local businesses, and hotels already report strong demand for 2016.

All of this comes as drought and increasing wildfires put the park’s namesake tree in danger.