WGBH

Exploring ancient Roman cities from England to Turkey, including their art, aqueducts, theaters and churches.

Charlotte starts her new job as governess for the mysterious Alexander Colbourne; Alison longs for her knight in shining armor; Georgiana receives bad news; Tom and Colonel Lennox make plans for Sanditon's development.

Charlotte and Alexander Colbourne reach an understanding as she and Colonel Lennox enjoy a close encounter; Alison falls for her new beau; Clara seeks Esther's help.

Mister Rogers brings in a cat named Jimmy and remembers him as a kitten; he shows pictures of babies that have grown into adults; everyone gathers at the castle just as the big thing rolls into the Neighborhood of Make-Believe.

Pepe the circus flea tells Kate, Pal and Amigo his personal story; D.W. wants to be kissed.

Which are better, horns or antlers? Martin and Chris decide to go on an adventure with the horned Narwhal of the Arctic. Once they get there, they soon discover that sometimes a horn isn't a horn and soon are unraveling the mystery of this creature.

The Hunters find a stowaway in their picnic basket, a little furry dog.

Lyla and Everett coach Luke, Stu and Idris in soccer drills before their first practice; Liana and Louise decide to switch rooms with Lyla and Luke.

Carl and his friends clean up the Fuzzytown Park; Carl accidentally breaks the birthday present Sheldon planned to give his mom.

Daniel and his friends dance, sing and tell jokes that show their love and care for each other; Daniel hides hearts around the house to show his love for Grandpere.

Phoebe and Jay set a new record for the longest paper airplane fight; Phoebe and Jay learn how to build a stable pillow fort.

When Oscar tries to find someone disappointed by his disappoint-o-meter, he accidentally makes them happy.

Two young activists fight for causes they believe in, including Black Lives Matter and fighting Asian hate.

Red chili with coffee and jalapeno cheddar cornbread waffle bowl; white beans with shrimp; black beans and rice.

Lemony, crispy skinned branzino along with beet, beans and feta salad and lemon potatoes; Varvakios Central Market in Athens; using canned sardines for a quick and easy pantry taco.

Volunteers behind God's Love We Deliver; Korean corn dogs and traditional dance; Asian American moms-turned-organizers fight lunch shaming.

Harvesting and charring nopales over an open flame; celebrating the traditions of Milpa Alta's community over a meal of mole and nopales.

Old-school techniques of stone-grinding and making the perfect sourdough; using Baker's Field Flour in a delicate tart.

Shrimp and melon salad with basil mint pesto; peaches in white wine; mezze rigatoni with raw tomato sauce.

Cheese enchiladas with salsa roja; Mexican cowboy beans flavored with bacon and chipotle; Mexican-style corn with chili and lime.

Stewed leeks with prunes and tomato; olive oil poached fish; feta and herbs preserved in olive oil; chocolate olive oil mousse.

Dry chili chicken; breaking down different miso; sour and hot Napa cabbage.

Aunt Jules' pie; Louisiana-style hot sauces; Gullah Lowcountry red rice.

Turning uneaten apples into oatmeal; making syrup from scraps; cooking with imperfect produce; a sheet pan dinner with grapes, bratwurst and Brussels sprouts.

Professor and historian Dr. Henry Louis Gates Jr. talks about researching the genealogy of high-profile guests on the PBS series "Finding Your Roots.".

Former U.N. Ambassador Stuart Eizenstat reflects on President Jimmy Carter's life and legacy.

Science, health, technology and environment experts and professionals address issues such as artificial intelligence, race, medicine and climate science.

Teams compete from a statewide roster to become the next academic champions.

Mantrap; portrait of an insurance chairman; a 14th-century seal; a teapot that was possibly used by Nelson.

Exploring St. James's, the palace at the heart of the monarchy, built by Henry VIII.

Dylan Cooper is caught and held in the cells at Scotland Yard; Blake and new detective Willows face a long night as Dylan's gang plots a daring escape.

James is worried about the practice finances, but it falls on deaf ears when he tries to discuss the matter with Siegfried; he decides to take on the role of an attending vet at Hensfield dog track to earn extra money.

When an army captain drinks a poisoned cocktail, there are multiple suspects, including Trottie; two exiled princesses believe that he was not the intended victim.

Tracey gets the proposal she needs; Bobby learns love can take unexpected turns; Nick looks back on the painful lesson of first love.

Actor, singer-songwriter and instrumentalist Loah.

Georgiana faces a nearly impossible task, but help arrives from a surprising place; Lady Denham accepts a new vision for the town and spars with an old flame.

The day of Georgiana's trial arrives, and she gets a surprise visit from an old friend; Colbourne's shooting party goes ahead and as he gets closer to Lydia, Charlotte must confront what she's lost.

Visiting Arthur Mitchell at the Dance Theatre of Harlem; Lady Elaine renames her studio.

Buster receives chocolates in the mail and tries to figure out who sent them; James receives a toy lamb that is said to give its owner special powers.

The Wild Kratts are accidentally miniaturized while adventuring in the Amazon; they set out to retrieve the Miniaturizer stolen by a monkey, relying on the powers of the poison frog.

The Hunter kids head to the state park to learn why leaves change color.

The Loops celebrate the day they met Stu; Liana finds crumbs on Louisa's pillow and accuses her of taking the last cookie.

Lotta competes in the Fuzzytown Music Maker Championship, but the noise on stage becomes too much for her and she leaves; Carl forgets his bottle cap collection at his dad's house.

The whole neighborhood helps Dr. Anna and Baker Aker celebrate their wedding, including Daniel, who has an important job as ring bearer.

Phoebe and Jay use a checklist to guide them through their tasks; Jay creates his first comic book and learns about the importance of page order.

Reporters Elmo and Abby offer strategies to Nursery Rhyme characters experiencing big feelings of excitement, nervousness and frustration.

Tracey gets the proposal she needs; Bobby learns love can take unexpected turns; Nick looks back on the painful lesson of first love.

Exploring Virginia's history starting at Jamestown; Colonial Williamsburg; Punjabi cuisine at Masala Craft; rare instruments at the Virginia Musical Instrument Museum; exploring Yorktown's battlefields and Revolution Museum.

E-foiling on Lake Winnipesaukee; making whoopie pies at Moulton Farm; touring a sea scallop farm; cooking lobster pasta; exploring the food scene in Kennebunkport, Maine.

Sunny Hostin prepares a brunch dish using eggs hatched in her own backyard; Russ & Daughters in New York.

Features a cultural perspective on issues and ideas from communities around the corner and across the globe.

How animal parents deal with freshwater's constant changes as they raise the next generation; a frog dad scales giant trees with his tadpoles on his back; an elephant mom must choose between safety and the quest for food and water.

Astrophysicists and engineers look at evidence that supports the existence of UFOs.

Computer scientist Brent Seales attempts to read inside hundreds of carbonized ancient scrolls found at the archaeological site of Herculaneum in Italy.

Tracing the family trees of talk show host Sara Haines and playwright Tracy Letts.

Teams compete from a statewide roster to become the next academic champions.

Experts analyze prominent international affairs topics and America's role in a shifting world.

The 1990s and the rise in popularity of hip-hop, which finds itself attacked by all sides of the political establishment.

Hip-hop becomes a cultural phenomenon, producing multimillionaire artists and changing history.

Eliza investigates a foreign ambassador's death while partnering with a woman whose intellect and power mirror her own.

Tristan and Charlotte enjoy a romantic picnic at Beauvoir Manor; James checks in at Heston Grange.

As tension builds, the staff at the Walsingham Hotel rebel; Book discovers something quite curious in Captain Victor Orr's little black book.

Wayne, Pete and Mira attend to a critically ill baby; Eliza visits a patient requesting help with voluntary assisted dying.

Celebrating Europe's art and creative geniuses, from Leonardo Da Vinci to Vincent van Gogh; Florence's bold "rebirth" after Europe's medieval struggles; impressionist works of the late 1800s.