24 years ago, a Ryder truck packed with nearly 5,000 pounds of explosives was parked in front of Oklahoma City's Alfred P. Murrah Federal Building. In a matter of seconds, the blast destroyed most of the nine-story concrete and granite building, and the surrounding area looked like a war zone. Dozens of cars were incinerated, and more than 300 nearby buildings were damaged or destroyed. It killed 168 people, among them 19 children—most of whom were in the building’s daycare center. The youngest victim was 4 months old. On today's episode of America's National Parks, the Oklahoma City National Memorial, and one of the largest and most complex cases the FBI has ever undertaken.

On December 8, 1941, the day after the Japanese attack on Pearl Harbor, President Franklin Delano Roosevelt delivered his famous “Day Of Infamy Speech." The United States had entered World War II. That evening, his wife would call on all Americans to focus on the war effort and to support the nation’s leaders in the difficult days ahead. She had also entered the war.

On Today's episode of America's National Parks, Eleanor Roosevelt—the only first lady to have a National Park Service Unit in her honor—and her critical role in World War II.

In 1848, gold was discovered in California and people from all over the United States packed their belongings and began to travel by wagon to what they hoped would be a new and better life. It was important to leave Salt Lake City and cross the desert before snow began to fall on the Sierra Nevada, making them impassible. A group of wagons began their journey in October of 1849, much too late to try to cross safely. It was then that they heard about the Old Spanish Trail, a route that would take them on a harrowing adventure that nearly killed them all. On today's episode of America's National Parks, the place that these prospectors would come to call Death Valley.

Surely if you listen to this podcast you've heard the news — America now boasts 61 National Parks. Buried within a massive spending bill protecting public lands signed by the President on February 15, 2019, was a provision that simply stated: Public Law 89-761 is amended by striking National Lakeshore each place it appears and replacing it with National Park. Today's episode—the new Indiana Dunes National Park.

Like Joshua Tree, and Wind Cave, and Petrified Forest, Indiana Dunes National Park is much more than the singular characteristic it's named after. It features more than 1,100 native plants ranking it fourth in plant diversity among all National Park Service sites. It's full of mysterious wetlands, bright prairies, wandering rivers and tranquil forests. You can play on the massive sand dunes, but you can also harvest maple sugar from the park's historic farm.

The Alamo is certainly San Antonio’s most famous landmark, perhaps even the most famous building in Texas, because of its pivotal role in the 1836 Texas Revolution. But the Alamo was built over a century prior as Mission San Antonio de Valero, by Spanish settlers on the banks of the San Antonio River. Beginning in 1690, Spanish friars established missions in what is now East Texas as a buffer against the threat of French incursion into Spanish territory from Louisiana. The Alamo is a Texas state historic site, but nearby, four sister missions, all still working Catholic churches, are protected by the National Park Service as the San Antonio Missions National Historical Park.

This episode follows four people connected to the Missions: a stonemason, a historian, a descendant, and a former church administrator. Their stories comprise Michael Nye's "Four Voices" exhibit on display at Mission Concepción.

In 1833, a small organization formed with the purpose to fund and build a monument "unparalleled in the world," in honor of once commander-in-chief of the Continental Army and the first President of the United States. Its completion, and its history, not unlike the Statue of Liberty, was fraught with funding issues, construction delays, and outside forces seemingly teamed against it. Today on America's National Parks, the Washington Monument, part of the National Mall and Memorial Parks in Washington, D.C.

During the Indian conflicts on the western plains after the Civil War, Native Americans gave Black regiments of the U.S. Army the name Buffalo Soldiers, after their short, curly hair, which to them, looked like a bison. The soldiers took a liking to the name, and it stuck.

The Buffalo Soldiers contributed to the U.S. in many ways over the course of nearly 90 years, but one of their most important was as the first caretakers of our national parks. Between 1891 and 1913, the Army was tasked with the protection of Yosemite and Sequoia National Parks. Buffalo soldiers fought wildfires and poachers, ended illegal grazing of livestock on federal lands, and constructing roads, trails and other infrastructure. In 1903, Captain Charles Young led a company of Buffalo Soldiers in Sequoia and what is now Sequoia and King's Canyon National Parks, becoming the first African American park superintendent.

At the turn of the 20th century, the eastern half of the American landscape looked very different than it does today. It was blanketed in 4 billion towering American Chestnut trees. Over the course of 50 years, they all vanished. Today on America’s National Parks, a tree disease that altered America and a chance at rebirth on the site of one of our nation’s greatest tragedies.

Ridge upon ridge of forest straddles the border between North Carolina and Tennessee, where ancient mountains, covered in pine, glow in purple, pink and blue hues, as a smoky mist rises from their thick cloak of trees. World-renowned for its diversity of plant and animal life, this is also a place to explore what remains of Southern Appalachian mountain culture. This is America's most visited national park — the Great Smoky Mountains.

On today’s episode, the story of 6 sisters who lived off this great land, all on their own.

As we release this episode, the longest government shutdown in American history is still underway, and 800,000 government workers are on furlough, including rangers and other protectors of our wildlife and national treasures. Those that remain on the job, mainly law enforcement rangers, are working without paychecks, and are facing protecting federal lands that remain open to visitors with very little support.

We thought this was an appropriate time to again highlight those rangers and other federal employees in the interior department.