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The world's most incredible engineering projects are revisited to uncover why places full of mysteries and untold secrets are now abandoned ruins.

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An in-depth examination of some of the most stunning and emotional courtroom moments caught on camera. A behind-the-scenes look into some of the most wild, unruly and dramatic moments caught on tape in courtrooms across the country; witnesses, judges and victims share their perspectives of the emotional outbursts and chaotic moments.

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Victims' rights activist John Walsh and his son, Callahan, showcase time-sensitive, unsolved cases in desperate need of attention, mobilizing the public to engage in the pursuit of justice. IN PURSUIT WITH JOHN WALSH stars John Walsh and features his son, Callahan Walsh, as a correspondent who works alongside his father at the National Center for Missing and Exploited Children. IN PURSUIT WITH JOHN WALSH works toward tracking down fugitives.

In each episode of IN PURSUIT, John Walsh leads viewers through unsolved violent crimes that urgently need to be closed – where time is of the essence and vigilant viewers could bring these criminals to justice. Joining John in every episode is his son, Callahan Walsh, who leads the operation on the ground, working in tandem with the community and local authorities to search for persons-of-interest. In partnership with the National Center for Missing & Exploited Children (NCMEC), the series also features two missing children each hour, providing age-progression photos and descriptions in the hopes that viewers can provide new leads to their whereabouts.

Investigation Discovery taps into its uniquely engaged audience to help track down these persons of interest and find missing children. The show utilizes an always active call center at 1-833-3-PURSUE and dedicated online hub at InPursuitTips.com, both staffed by trained English and Spanish-speaking operators who accept anonymous tips and alert the proper authorities. To engage with the show, viewers are encouraged to connect using the hashtag #TeamInPursuit, join the IN PURSUIT WITH JOHN WALSH Facebook page at Facebook.com/InPursuitwithJohnWalsh, and connect on Instagram @InvestigationDiscovery or Twitter @DiscoveryID.

Returning for a third season, In Pursuit with John Walsh carries forward John Walsh's lifelong mission of bringing fugitives to justice, finding missing children, and empowering the public to help support a more effective and accountable criminal justice system. In the series, John Walsh and his son, Callahan Walsh, introduce ID's active and engaged audience to unsolved violent crimes that urgently need to be closed. In Pursuit relies on leads from viewers who may have seen something that would help authorities, with all calls and online tips vetted by experts and followed up on by the appropriate authorities, including local law enforcement, FBI, and the U.S. Marshals. The first two seasons are available to view at discovery+, the definitive nonfiction streaming service now available from Discovery Inc.

In the premiere episode airing on Wednesday, August 18 at 10/9c, the investigation into the disappearance of a devoted single mother narrows in on a man who claims to be her secret boyfriend. But after Erik Arceneaux goes on the run, John is determined to find him and deliver answers to Maria Jimenez Rodríguez's family. Then, in 1989, 11-year-old Alisha bravely comes forward to reveal that her adopted father, Mark Blevins, sexually abused her for years before going on the run. Thirty years later, Callahan learns the dark truth behind a picture-perfect family and joins the hunt to bring him to justice.

About John Walsh

John Walsh is known internationally as a crime fighter, victims' advocate and Emmy Award-winning host of "America's Most Wanted," the reality program that helped law enforcement capture more than 1,200 fugitives and brought home more than 50 missing children. He never sought the role, but fighting for justice has been his mission since July 27, 1981 - the day his 6-year-old son, Adam, was abducted from a Hollywood, Fla. mall near their home. Adam's remains were found two weeks later. Through their experience, Walsh and his wife Revé, realized that the nation was in desperate need of leadership in the fight to protect children. Out of their pain, the National Center for Missing & Exploited Children was created in 1984, after President Ronald Reagan signed the "Missing Children's Assistance Act." Walsh has been honored numerous times by many local, state and federal agencies. In addition to being named "Man of the Year" by both the U.S. Marshals Service and the FBI, John was made an honorary U.S. Marshal. He is only one of three people to receive this honor in the organization's history. Walsh has been the driving force behind major pieces of child protection legislation. This work led to him being honored five times by four presidents. The Walshes had three more children after Adam and John continues to fight for victims' rights.

About Callahan Walsh

Callahan Walsh is a child advocate for the National Center for Missing & Exploited Children (NCMEC). At the National Center, Callahan works together with law enforcement, including the U.S. Marshals Service, to further NCMEC's mission and to help change laws in favor of child victims. He is the son of John and Revé Walsh, who co-founded NCMEC in 1984 after the kidnapping and murder of their first son, Adam Walsh. Following in his parent's footsteps, Callahan has focused his energy on helping find missing children, reducing child sexual exploitation and preventing child victimization.

About the National Center for Missing & Exploited Children

Since 1984, the National Center for Missing & Exploited Children(R) has served as the leading private, nonprofit organization helping to find missing children, reduce child sexual exploitation and prevent future victimization. As part of its work as the clearinghouse and resource center on issues relating to missing and exploited children, NCMEC operates a hotline, 1-800-THE-LOST(R) (1-800-843-5678), and has assisted in the recovery of more than 311,000 missing children. NCMEC also operates the CyberTipline(R), a mechanism for reporting suspected child sexual exploitation, which has received more than 60 million reports. To learn more about NCMEC, visit www.missingkids.org.

IN PURSUIT WITH JOHN WALSH is produced for Investigation Discovery by Jupiter Entertainment. For Jupiter, Harrison Land, Stephen Land, and Gregory Palmer are executive producers. For ID, Lorna Thomas is senior executive producer.

With 12 all-new episodes, the season three premiere of In Pursuit with John Walsh will begin streaming on discovery+ on Wednesday, August 18, and will air weekly on ID at 10/9c beginning August 18.

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