I've visited 39 US national parks. One stands out as the most underrated and unique.

Upon pulling up to Central Avenue in Hot Springs, Arkansas — about 50 miles southwest of Little Rock — I was pleasantly surprised to see an iconic national park sign posted on a public street corner.

Unlike many national parks that require driving through an official entrance to pay a fee (or making a timed reservation in advance), the grounds at Hot Springs National Park are open to the public and free to enter.

Although visitors can still find more than 26 miles of beautiful trails in Hot Springs National Park, the historic bathhouses set this park apart from others.

The centerpiece of Hot Springs National Park is Bathhouse Row: eight buildings constructed between 1892 and 1923.

In their heyday, these bathhouses hosted worldwide visitors seeking relaxation and healing in the mineral-rich water pumped in from nearby natural hot springs.

Today, they've been repurposed in a variety of unique ways.

The Fordyce Bathhouse, which now serves as the park's museum and visitor's center, was once a place 20th-century visitors flocked to for healing.

Visitors can walk through the restored bathhouse and get close to the whirlpool tubs, steam cabinets, multi-spray showers, lounge chairs, and other facilities that bathers once used.

Informative exhibits detail how physicians once wrote prescriptions for bathing in and drinking the thermal water.

Today, the Quapaw and Buckstaff bathhouses still offer therapeutic services. My husband and I sampled the four coed indoor hot-spring pools at Quapaw Baths & Spa.

Also available here are private mineral baths, body treatments, massages, and facials.

Next, we stopped by the Buckstaff Bathhouse, which has been in continuous operation since 1912, to indulge in the traditional bathing package.

Just as spa enthusiasts did a century ago, we headed to separate men’s and women’s locker rooms to fully undress and get wrapped in a large sheet, toga-style. Then, we were led around to the various hydrotherapy stations in gender-specific areas.

For $89 each, we soaked in a private mineral bath, got a loofah rubdown from an attendant, sat in a vapor cabinet, squatted in a sitz bath, got wrapped in steamy hot towels, and enjoyed a 20-minute massage.

I felt like a floppy noodle when it was all over — in a good way.

The Superior Bathhouse, which operated from 1916 to 1983, reopened as a brewery in 2014. This casual spot with lots of outdoor seating is the only brewery in a US national park.

We enjoyed Superior Bathhouse Brewery so much that we visited it twice. One afternoon, we went to an Oktoberfest celebration with live music and special menu items, like bratwurst and pretzels. The next day, we sampled more of the brewery’s 18 draft beers.

Next to the brewery is Hotel Hale, which is the oldest building on Bathhouse Row.

Dating back to 1892, the former Hale Bathhouse is now home to nine hotel suites. Each room features a tub for soaking in piped-in geothermal mineral water.

Gentle walking paths and more rigorous hiking trails are both part of the experience for visitors seeking good health in Hot Springs, Arkansas.

We accessed trails just behind Bathhouse Row, spending a couple of hours strolling through the forest. Over 26 miles of trails weave through the hills and canyons on either side of Central Avenue.

As a fan of water wellness, hiking, and hops, I loved visiting Hot Springs National Park.

The well-done museum, opportunities for soaking in a historic bathhouse, and various hiking trails make this national park well worth a road trip stop or weekend getaway.