30 years ago this weekend, the Berlin Wall fell. To assess this historic anniversary and its consequences, Christiane speaks with three people who witnessed history first hand: Christopher Mallaby was Britain’s Ambassador to West Germany when the Wall fell, while historian Timothy Garton Ash and Russian foreign policy expert Andrey Kortunov were both in Berlin that fateful night.

A new production in London’s West End offers a fresh interpretation of Arthur Miller's "Death of a Salesman": at the suggestion of Miller’s daughter Rebecca, the central Loman family is African American. Actor Wendell Pierce plays patriarch Willy Loman, and he joins Christiane to discuss his role and the significance of African American art.

”The Last Black Man in San Francisco” is a semi-autobiographical film following Jimmie Fails as he tries to regain his father’s house. It’s a passion project for its star—he and the director, Joe Talbot, first conceived of the film when they were just teenagers. Fails sits down with Hari to discuss how he feels now that it has turned out to be one of the best-reviewed films of the year.

The Westboro Baptist Church is known for picketing military funerals and its celebration of death and tragedy, even the 9/11 attacks. Megan Phelps-Roper is the granddaughter of the church's founder and was one of its staunchest members. But seven years ago, she broke away and now works to combat extremism. She sits down with Michel to talk about her journey and new memoir "Unfollow."

Once a leading practitioner of Russia’s brand of “gangster capitalism,” Mikhail Khodorkovsky now lives in exile in Britain, supporting the anti-Putin opposition. He spent a decade in jail in Russia based on politically motivated charges, and his story is the focus of a new documentary by Oscar-winning filmmaker Alex Gibney. They both join the program to discuss this quintessentially Russian story.

Come Tuesday, Montgomery, Alabama, will celebrate the inauguration of Steve Reed, its first African American mayor. The majority-black city is plagued by crime and economic inequality, in a state ranked dead last for education. As he prepares to take office, Christiane asks Mayor-elect Reed about his daunting to-do list and the history he is making.

Professor Leonard Kleinrock and his former student Vint Cerf – now Vice President of Google – are known as the founding fathers of the internet, after they pioneered the technology that underpins it. It’s changed the world and the very way we live, yet at the time, they had no idea just how big their work would become. Miles O’Brien sits down with them both to reflect on those early days.

Most of Kashmir's leaders have reportedly been detained since the disputed territory was stripped of its special autonomous status in August. Among them is former Chief Minister Mehbooba Mufti. Her daughter joins the program from New Delhi to try and get a near-silent international community to listen.

Democrats have taken control of the Virginia statehouse for the first time in decades, and after a tight election, Democrat Andy Beshear is declaring victory as Governor of the deep red state of Kentucky. How much can be read into these results as bellwethers for 2020? Republican campaign consultant Scott Jennings and political columnist for The Nation John Nichols join the program to discuss.

A group of musicians and performers are taking Broadway by storm with their new show, "Freestyle Love Supreme," masterminded - among others - by "Hamilton" creator Lin-Manuel Miranda. A meeting point between rap and improv, every day is different, as the show is based on audience suggestions. Hari sits down with three of the cast members for a lesson in freestyling.

President Trump's formal pledge to withdraw from the most ambitious climate accord to date - the Paris Agreement - comes at a time when we can see environmental emergencies right in front of our face. In California, raging fires burned nearly 100,000 acres, forcing thousands to flee their homes. Christiane speaks with the state's Lieutenant Governor to explore the crisis.

Five weeks from now, the British people face another general election, which once again attempts to resolve the bedeviling issue of how - or even if - the country should leave the European Union. George Osborne was in charge of the U.K.'s finances as Chancellor of the Exchequer when Britain narrowly voted for Brexit, and now is the editor of the Evening Standard. He joins the program from London.

Twitter co-founder Ev Williams stepped away from the company to turn his attention to Medium, an online publishing platform designed to showcase longer, more nuanced content. Williams tells Walter that while Twitter needs to take responsibility for the quality of its content, it shouldn’t risk losing its role as a place for the exchange of important ideas.

Legendary actress Julie Andrews became a household name with Mary Poppins, and has rarely left our screens since. Her new memoir, “Home Work,” covers her incredible years at the heart of Hollywood, including “The Sound of Music” and her sometimes difficult marriage to film director Blake Edwards. She joins Christiane in London to discuss mental health and her dazzling career.

Deadly protests have erupted in Iraq in the biggest wave of demonstrations since the fall of Saddam Hussein, echoing recent demonstrations in Lebanon. Two regional experts join Christiane to clarify the situation: Vali Nasr has served the State Department and spent years studying the region, while Karl Sharro is a Lebanese-Iraqi satirist who tweets razor-sharp commentary on the Middle East.

In corporate America, it is now widely accepted that diversity of gender, race, and background makes any organization perform better. It's the reason why StubHub President Sukhinder Singh Cassidy founded theBoardlist, a talent recruitment forum. She sits down with Hari to discuss how diversity can be bolstered in the tech industry.

Religion scholar Karen Armstrong is a former Catholic nun who rose to prominence after 9/11, when she was able to do what few others would, or could: explain Islam to an angry and terrified West. She joins the program to talk about her new book and her amazing life story, from religious nun to secular scripture expert.

How could a man as demonstrably evil as Adolf Hitler come to power? And what lessons can we learn from this today? As populations around the world once again turn to authoritarian leaders, the questions aren’t academic. Historian Brendan Simms' new book explores Hitler’s rise to power, and he joins the program to explain how it’s not just the times that give rise to the worst type of leader.

Ocean Vuong's debut novel, “On Earth We’re Briefly Gorgeous,” spent six weeks on the New York Times bestseller list. Semi-autobiographical, it is written in the form of a letter from a young Vietnamese-American to his illiterate mother. Vuong speaks with Michel about the force behind his creative spirit.

Harriet Tubman is a true American hero, and now her remarkable story is coming back to life in the new movie "Harriet." Tubman escaped slavery and came to be known as the Moses of her people for leading others to freedom on the Underground Railroad. Cynthia Erivo stars as Harriet Tubman, and Leslie Odom, Jr. plays a prominent abolitionist who connected Tubman to the network.