Few of us associate the National Park Service with high tech. If anything, the parks are places to go off the beaten path and escape the wired world. But “X-Ray Yellowstone” (8 p.m. Sunday, Discovery), a new installment of “Curiosity,” looks at Old Faithful and other park attractions in a whole new light, employing brand-new imaging systems and scientific research to explore the park’s many wonders and examine ominous trends that threaten its wild inhabitants and even its very existence.

Chief among the unseen dangers is the giant super-volcano located right beneath Yellowstone. It is linked to geothermal activity that results in remarkable geysers, attracting visitors. But it’s also overdue for an eruption, an explosive event that would herald destruction well beyond the park’s boundaries.

• ABC trifles with tradition, moving its holiday broadcast of the 1965 musical “The Sound of Music” (6 p.m. Sunday) from its rightful place the night after Christmas. As such, it was the perfect movie for the weary couch potato to enjoy with family and Christmas company. (Or the perfect escape from them.)

Refreshingly chaste by today’s standards, “Sound” is not without its own sex appeal. I’ve known many women, including my wife, who harbored a crush on Christopher Plummer’s Captain von Trapp, and who freely admit to melting a little when he picks up the guitar and sings “Edelweiss.”

Sunday’s holiday highlights

• “Crazy for Christmas” (6 p.m., Lifetime).

• “Christmas With the Kranks” (7 p.m., FX).

• “The Bishop’s Wife” (7 p.m., TCM).

• “The Most Wonderful Time of the Year” (7 p.m., Hallmark).

• “All She Wants for Christmas” (7 p.m., Lifetime Movie Network).

• “Jeff Dunham’s Very Special Christmas Special” (8 p.m., Comedy Central).

• “Anything but Christmas” (8 p.m., ION).

• “The Case for Christmas” (9 p.m., Hallmark).

Sunday’s other highlights

• Repeat segments scheduled on “60 Minutes” (6 p.m., CBS): profiles of Adele, Rodriguez and Taylor Swift.

• The Seattle Seahawks host the San Francisco 49ers on “Sunday Night Football” (7 p.m., NBC).

• The gals plan a road trip to sites central to the history of American polygamy on “Sister Wives” (8 p.m., TLC).