How Did They Build That? Season 4 Episode 5 405 Airs August 24 2025 on Smithsonian

The upcoming episode of “How Did They Build That?” promises to be a thrilling exploration of the incredible feats of structural concrete engineering. Titled “405,” this fifth episode of Season 4 will air at 9:00 PM on Sunday, August 24, 2025, on Smithsonian. Audiences can expect to witness some of the most remarkable buildings, bridges, lifts, and other structures that have pushed the limits of what concrete can achieve.

In “405,” the show will delve into the innovative techniques and designs that have transformed concrete from a simple building material into a powerhouse of engineering. Viewers will see how architects and engineers have tackled complex challenges to create stunning structures that not only serve a purpose but also stand as works of art. From towering skyscrapers to intricate bridges, each project featured will highlight the creativity and skill involved in modern construction.

As the episode unfolds, it will take a closer look at the stories behind these impressive creations. The challenges faced during construction, the breakthroughs in technology, and the visionaries who made it all possible will be highlighted. This episode will inspire anyone interested in architecture and engineering, showcasing the extraordinary possibilities that concrete offers in building the future.

Release Date & Time: 9:00 PM Sunday 24 August 2025 on Smithsonian

How Did They Build That? 405 Cast – Season 4 Episode 5