Journalist Thomas Erdbrink documents the people and daily life inside the Islamic Republic of Iran on “Frontline.”

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“Sacred Sites”

Second-season premiere of docuseries that uses locations around the world for investigations takes a look at the legend of Camelot; King Arthur has been regarded as a mythical figure, but new evidence from ancient sites suggests that the Arthurian legend is rooted in fact and may provide the answer to whether this storied king was real or myth; 8 p.m. Monday on SMITHSONIAN.

Also on Monday

“Bachelor in Paradise,” 8 p.m. (KOMO): Stars and villains from “The Bachelor” and “The Bachelorette” get another chance to find love.

“American Ninja Warrior,” 8 p.m. (KING): The top 30 competitors from the qualifying round face the new obstacle called Captain’s Wheel as they vie for a chance at the national finals.

“So You Think You Can Dance,” 8 p.m. (KCPQ): A dancer is eliminated, and the remaining nine perform for viewers’ votes.

“Whose Line Is It Anyway?” 9 p.m. (KSTW): Game show with guest comic Brad Sherwood and TV personality Carmen Electra.

“Better Call Saul,” 9 p.m. (AMC): Jimmy seeks new employment; Gus navigates the fallout from Hector’s collapse; Kim supports Jimmy in the wake of Chuck’s death.

“Frontline,” 9 p.m. (KCTS): Journalist Thomas Erdbrink documents the people and daily life inside the Islamic Republic of Iran.

“The Proposal,” 10 p.m. (KOMO): Ten men vie for the affections of a woman looking for the one who can mend her heart.

“Lodge 49,” 10 p.m. (AMC): Dud becomes acquainted with the Lodge; Ernie battles with his fellow Lynx.

Madeline McKenzie: mmckenzie@seattletimes.com. Program times may vary depending on your cable provider or service.