Hot Springs is the smallest of the 59 national parks in the country.
The Arkansas park is so small -- just 5,550 acres -- that it could fit into Wrangell-St. Elias National Park nearly 2,400 times.
It would also likely melt its Alaskan cousin: That's due to the park's 47 hot springs coming out of Hot Springs Mountain at 143° Fahrenheit (62° Celsius).
It was first protected as a reservation in 1832 because of the popularity of its geothermal spring water for therapeutic bathing.
Many businesses set up around Hot Springs to provide access to the waters, and the urban park protects the historic bathhouse structures as well as the waters.
Visitors can soak in the traditional Buckstaff Baths (a park concessionaire) and the more modern Quapaw Baths & Spa. Both are on Bathhouse Row, as is the park visitor center in the old Fordyce Bathhouse.