'UNDER THE DOME': Julia (R, played by Rachelle Lefevre) seeks out the help of a stranger to save the life of a mysterious girl named Melanie (L, played by Grace Victoria Cox) who may hold clues to origin of the Dome. (BROWNIE HARRIS/CBS)

Continuing its European tour, “The Bachelorette” (ABC at 8 p.m.) is in Brussels, where one bachelor reveals his past, another attends a concert during his one-on-one and the other four go on a bike ride with Andi to the ruins of a castle. Following an elimination, the final four bachelors are revealed.

NBC is making Orlando’s Universal Studios all the more tempting this summer by airing the special “Harry Potter: The Making of Diagon Alley” (8), which gives viewers a behind-the-scenes look at the beloved shopping sector from the book and film series.

The 16 remaining chefs are challenged with a mystery ingredient as they prepare dishes using canned foods in the reward challenge on “MasterChef” (Fox at 8). The winner is then awarded time with “MasterChef” champion Luca Manfe and the chance to select the dish that the others will cook for the elimination round.

“Antiques Roadshow” (MPT and WETA at 8) stops in Columbus, Ohio, to appraise a trio of Albert Cheuret art deco clocks, a Roy Rogers play set and a letter from Thomas Jefferson.

“Masterpiece Mystery: The Escape Artist” (WHUT at 8) concludes with Will Burton (played by David Tennant) at risk of losing his case.

Kate learns the truth about her husband while Audrey goes head-to-head with Boudreau, all while the terror threat continues to rise on “24: Live Another Day” (Fox at 9).

Reviewed by Post TV Critic Hank Stuever above, the documentary “112 Weddings” (HBO at 9) follows professional wedding videographer/documentarian Doug Block as he goes back to see what’s happened to all the couples who hired him for their weddings over the years.

RETURNING SHOW: Stephen King’s “Under the Dome” (CBS at 10) returns for Season 2 with Barbie in danger and Julie coming to the aid of a girl who may have clues about the origin of the dome.

Comedian Ricky Gervais and newcomer Ansel Elgort stop by “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), with Miranda Lambert playing musical guest.

Comedian Louis C.K. and perfect-person Amy Sedaris come to the “Late Show With David Letterman” (CBS at 11:35). Plus, a performance from the Broadway musical “Rocky.”

Actress Melissa McCarthy and comedian Marc Maron are on “Jimmy Kimmel Live” (ABC at 11:35), along with a musical performance from Royksopp and Robyn.

Rachel Lubitz