How Did They Build That? “405” S4E5 August 24 2025 on Smithsonian

On Sunday August 24 2025, Smithsonian broadcasts How Did They Build That?!

405 Season 4 Episode 5 Episode Summary

The upcoming episode titled “405” of “How Did They Build That?” promises to take viewers on an exciting journey through the world of structural concrete engineering. This episode will air on Smithsonian and is set to showcase some of the most remarkable buildings, bridges, lifts, and other structures that have pushed the boundaries of engineering.

In “405,” the focus will be on the innovative techniques and designs that have made these incredible structures possible. The episode will highlight how engineers and architects have overcome challenges to create safe and functional buildings that stand tall against the test of time. Audiences can expect to see stunning visuals of these architectural marvels and learn about the science behind their construction.

As the episode unfolds, it will explore the stories of the people who brought these projects to life. From the initial concepts to the final touches, viewers will gain insight into the teamwork and creativity involved in each project. This behind-the-scenes look will reveal the dedication and skill required to transform bold ideas into concrete reality.

“405” is sure to inspire those interested in engineering, architecture, and construction. With its captivating content and informative approach, this episode will celebrate the achievements of those who have contributed to the world of structural concrete engineering. It is an opportunity to appreciate the beauty and complexity of the structures that shape everyday life.

What Time is the “405” Episode On?

The 405 episode of How Did They Build That? will be broadcast on August 24 2025 on Smithsonian at 9:00 PM at ET/PT.

Is the “405” Episode New?

The 405 episode of How Did They Build That? is all new!

How Did They Build That? 405 Cast & Stars

Main Cast

405 Episode Videos & Previews

Watch How Did They Build That? 405 Online

Watch the show online

How Did They Build That? Series Information

An exploration into impressive man-made structures, investigating how new materials and cutting-edge technology allows engineers, builders and architects work to the limits of what is possible.