▲In Cookeville, TN there lies a stunning 75-foot (23-meter) waterfall that has been a gem among Tennessee natives for generations, but now tourists are getting in on the secret.

▲The hike to reach Tennessee's eighth largest waterfall is no small feat, but walking along the gorgeous Blackburn Fork State Scenic River on the way is a treat in itself.

▲This crystal-clear spring on the west bank of the Withlacoochee River is one of Florida's most popular swimming holes. If diving is your thing, the pool descends nearly 25 ft (8 m) into the earth’s surface.

▲A word to the wise, if you want to avoid massive crowds that flood the spring during tourist season then be sure to visit early in the day.

▲The iridescent spring-fed pools maintain an average temperature of 72ºF (22°C)year-round.

▲In the heart of the Grand Canyon lies one of Arizona's most spectacular swimming holes beneath a breathtaking 100-foot (30-meters) tall waterfall.

▲This breathtaking sinkhole is a popular swimming spot among locals. Plus, the igneous rocks surrounding the tide pool are the perfect springboards for divers.

▲If you needed another reason to visit the Hawaiian island of Kaua'i, swimming in the warm turquoise waters at Queen's Bath would definitely be one.

▲There are plenty of refreshing swimming holes along the river to cool off, such as Hippie Hole. Be sure to stay safe from powerful currents and only swim when the tide is low.

▲The Little River in northeastern Alabama runs for 12 mi (19 km). The water eventually plummets down a 600-foot (183-meter) canyon bordered by cliffs made of massive blocks of sandstone.

▲In the heart of North Carolina's Pisgah National Forest, you can find a local favorite swimming spot during the hot summer months.

▲Who needs to go to a water park when there is a natural waterslide right in your own backyard? Here you can find water flowing across 60 ft (18 m) of flattened rock down into a 7-foot (2-meter) deep pool.

▲This popular swimming spot in the White Mountain National Forest is also easy to reach, with a fairly flat path half a mile from the closest parking lot.

▲This collection of granite basin pools and miniature waterfalls beneath the Big Attitash Mountain is a must-see when visiting New Hampshire.

▲Regardless of drought, these natural springs keep flowing year-round at 68ºF (20°C), deep in the woods of Hill County, TX.

▲Because this private park is a bit outside of Spicewood, it is generally less crowded. Plus it is perfect for camping and boating, unlike swimming holes closer to the city.

▲Due to the immense popularity of this swimming hole, it is crucial to come early during high tourist season if you want to avoid crowds.

▲This iconic natural spring can be found just 45 minutes outside of Austin, TX. The pool was created when the dome of an underground river collapsed from erosion thousands of years ago.

▲No hiking needed to see this beauty! You can see this stunning natural wonder just off the road in the Richland Creek area of northern Arkansas.

▲This beautiful waterfall spills out into an equally splendid swimming hole that is popular with locals in the summertime.

▲This swimming hole along the edge of the Big Scrub in Salt Springs, FL is home to an archaeological site as well.

▲Besides having breathtakingly beautiful blue water, this natural spring basin is also perfect for swimming, snorkeling, and canoeing.

▲This spring-fed natural pool stays at a comfortable 64 °F (18°C) all day. It is also a great diving spot, with a depth of over 80 ft (24 m). Plus, given its remote location, it is still fairly unknown to tourists.

▲Santa Rosa, CA isn't called “The City of Natural Lakes” for nothing. However, one lake, hidden in a remote location in the desert, stands out from the rest.

▲Don't forget to bring your hiking shoes for this one, folks! The path down to the base of the falls is quite steep.

▲This Tennessee state park is home to an impressive 256-foot (78-meter) waterfall that flows into a plunge pool beneath. It's perfect for cliff jumping, or simply an afternoon swim.

▲Barton Springs is filled with water from three natural springs that have been dammed to create the three-acre-long pool in Austin, TX.

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The springs have been used by Native American tribes since the 1700s for spiritual practices, but were later obtained by the city of Austin to turn into a recreational area.

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This spring flowing from Cypress Creek is a famous spot for cave divers, and it attracts thousands of tourists every year.

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In the small town of Wimberly, TX you can find the state's longest underwater cave. Thousands of years ago this artesian spring used to be a secret meeting place for Native Americans.

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In the heat of summer, there's nothing better than taking a dip surrounded by the beauty of nature. If you're looking for gorgeous swimming holes, waterfalls, and natural springs, there are plenty to be found in the good ol' USA.

Here are 15 of the best spots to cool off on your next summer road trip. Click through the gallery to discover America's best natural pools.