W41DI-D

A look at whether giant asteroid impacts were actually essential for the creation of life on Earth.

A French explorer makes an unprecedented discovery in Alexandria's harbor that could reveal new information about Cleopatra's reign and her connection with the goddess Isis.

General Howe takes Philadelphia, but the Americans' surprising victory over General Burgoyne at Saratoga encourages France to support the U.S.

The evolving meaning of the Statue of Liberty and how it embodies values and conflicts in America, from abolition to the treatment of refugees.

The myths and realities of the American cowboy.

A visit to Rustico in Cuauhtemoc; a delicate tart made with goat cheese and fig; sampling bold ice cream flavors in Colonia Roma.

Touring the McAdams Farm in Efland, N.C.; strawberry tiramisu trifles; icebox salad; strawberry buckle; keeping strawberries fresh in storage.

General Howe takes Philadelphia, but the Americans' surprising victory over General Burgoyne at Saratoga encourages France to support the U.S.

The evolving meaning of the Statue of Liberty and how it embodies values and conflicts in America, from abolition to the treatment of refugees.

The myths and realities of the American cowboy.

Touring the McAdams Farm in Efland, N.C.; strawberry tiramisu trifles; icebox salad; strawberry buckle; keeping strawberries fresh in storage.

Mapping the roots of actress Lizzy Caplan and comic Hasan Minhaj, moving from shtetls in Eastern Europe to farmlands in northern India.

A 1901 Alexander Fisher enamel; a 1992 Olga de Amaral "Lost Image VII" tapestry; a signed 1936 "Gone With the Wind" first edition.

A snapshot of Europe in the year 1000 and Ireland's place within it; the rise of the Tudors, which coincided with the Protestant Reformation.

The lives of badgers, red deer, hen harriers and puffins, from Skellig cliffs to forest dens.

The rise and fall of classical Rome; Bernini's Baroque Rome; the Vatican; Rome's romantic night spots.

It is April 1968 and change is coming to Nonnatus House; the sisters intend to make a good impression on new recruit Sister Veronica.

Lucille struggles with her mental and emotional health; Sister Julienne worries about a red rash on a patient's breast and a referral is quickly made to St. Cuthbert's.

As she sets about helping a mother whose newborn baby is suffering from a clotting disorder, Nancy is harboring a secret of her own; Sister Veronica meets a newlywed on her rounds and the case shocks the women of Nonnatus house.

Nurse Crane is shocked when her fitness comes into question; Trixie cares for a Hindu mother and her newborn twins; a gastroenteritis outbreak is declared at the maternity home.

Nancy oversees a child born out of wedlock, but things take a turn; Dr. Turner and Sister Veronica discuss a new contraception procedure: the vasectomy; the Board of Health delivers unwelcome news to Sister Julienne.

Sister Veronica spearheads a new initiative to monitor the health of working children in the borough; Trixie is thrown into a challenging case involving an underage mother.

Preparations for Trixie and Matthew's wedding are underway; Nancy makes a home visit to Imelda O'Connor and is surprised that Imelda, her husband Maurice and young son Paul are living in a cramped caravan on a building site.

A series of disasters threaten Trixie and Matthew's wedding day; a horrific car crash turns into a race against time; Sister Julienne hatches a plan to save Nonnatus House.

Scientists and filmmakers explore the icy waters of Antarctica to observe how killer whales hunt.

New evidence sheds lights on the life and mysterious collapse of Cambodia's ancient jungle city.

Experts combine history, archaeology and forensic investigation into a quest to prove women fought alongside men in Rome's ancient amphitheaters.

A 1901 Alexander Fisher enamel; a 1992 Olga de Amaral "Lost Image VII" tapestry; a signed 1936 "Gone With the Wind" first edition.

A snapshot of Europe in the year 1000 and Ireland's place within it; the rise of the Tudors, which coincided with the Protestant Reformation.

The lives of badgers, red deer, hen harriers and puffins, from Skellig cliffs to forest dens.

A tranquil cruise along the rivers and canals of France's Burgundy region; tasting the vintages of the Cote-d'Or.

A treasure hunt brings Moses back to London to sell a priceless diamond; Clarence is determined to prove he is as good as his predecessor.

When "Captain Farnon" is requested at the new and prestigious Beauvoir stables, everyone is confused by the arrival of both Tristan and Siegfried to tend to the horse, Philbrick.

There's excitement in the air when a film crew arrive at Archangel Lane, until an extra drops dead after eating poisoned chocolates meant for one of the cast.

Exploring Myrtle Beach, from the Carolina shag and classic mini golf to the Carolina Opry and Sea Captain's House; accessible attractions for travelers with mobility challenges and families with autism.

Regional traditions surrounding pumpkins in Illinois; the largest collection of jack-o'-lanterns in the world; a fourth generation pumpkin grower; making a pumpkin and squash soup; sampling a pumpkin seed mole.

Exploring Taiwan's natural beauty, culture and history by train.

The old town of Baracoa, Cuba, has its own heritage of mixed Caribbean and African culture; Cuba's sugar cane fields, mountain ranges, bays and cliffs.

For the first time in decades iconic Minnesota rockers Soul Asylum return to the 7th Street Entry; Loki's Folly.

General Howe takes Philadelphia, but the Americans' surprising victory over General Burgoyne at Saratoga encourages France to support the U.S.

Hiking through local villages and trekking mountain gorillas in Uganda; tracing the path Katherine Hepburn took on "The African Queen"; Patience, a director in Entebbe, tells "decolonized stories" to bring dignity to her ancestors.

Luzern, Bern, Zurich and Lausanne; art created by inmates of an asylum; Swiss innovations such as drug policies and underground arsenals.

Exploring the Rideau Canal, the oldest continuously operating canal system in North America, including Ottawa's historic landmarks and farmers markets.

Mapping the roots of actress Lizzy Caplan and comic Hasan Minhaj, moving from shtetls in Eastern Europe to farmlands in northern India.

A 1901 Alexander Fisher enamel; a 1992 Olga de Amaral "Lost Image VII" tapestry; a signed 1936 "Gone With the Wind" first edition.

A 1954 Marilyn Monroe tissue with a soldier's letter; Paul Revere pottery vases; a 1942 Ted Williams game-worn Red Sox jersey.

A snapshot of Europe in the year 1000 and Ireland's place within it; the rise of the Tudors, which coincided with the Protestant Reformation.

The lives of badgers, red deer, hen harriers and puffins, from Skellig cliffs to forest dens.

Chef John Ng makes chompon ramen; chef Hai Truong makes pho with meatballs.

The soaring cliffs of Sliabh Liag in Donegal; cycling through Glenveagh National Park; exploring weaving traditions; Harvey's Point Hotel.

A tranquil cruise along the rivers and canals of France's Burgundy region; tasting the vintages of the Cote-d'Or.

The diverse culture of the Ryfylke; halibut farms, cider tastings and local legends.

Charlie Phelps hires Eliza for a case involving his uncle, Dylan Cooper; it turns out that Scotland Yard is also after Cooper, putting Eliza in the middle.

Tristan's romance with Charlotte is blossoming but he's nervous about impressing her dad.

Book must race against time to uncover the truth before anyone else ends up dead; Jack gets an unexpected answer when he confronts Trottie and Book.

Mapping the roots of actress Lizzy Caplan and comic Hasan Minhaj, moving from shtetls in Eastern Europe to farmlands in northern India.

A 19th century C. Jim Williams-owned Federal hunt board; Jesse Arms Botke oil circal 1940; a 1978 Tom Petty and The Heartbreakers-signed poster.