How Did They Build That? “401” S4E1 July 27 2025 on Smithsonian

On Sunday July 27 2025, Smithsonian broadcasts How Did They Build That?!

401 Season 4 Episode 1 Episode Summary

The upcoming episode titled “401” 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 limits of engineering.

In “401,” audiences will witness the innovative techniques and designs that have made these incredible structures possible. The show will highlight the challenges engineers faced while constructing these projects and how they overcame obstacles to create lasting landmarks. Each segment will focus on a different structure, providing insights into the materials and methods that define modern engineering.

As the episode unfolds, viewers can expect to learn about the history and evolution of concrete as a building material. The program will explore how advancements in technology have transformed the way engineers approach construction. From towering skyscrapers to intricate bridge designs, “401” will delve into the fascinating stories behind these feats of engineering.

Overall, this episode of “How Did They Build That?” will not only entertain but also educate on the complexities of structural concrete engineering. It will celebrate human ingenuity and the relentless pursuit of pushing boundaries in the realm of construction. Fans of engineering and architecture will find plenty to appreciate in this captivating episode.

What Time is the “401” Episode On?

The 401 episode of How Did They Build That? will be broadcast on July 27 2025 on Smithsonian at 9:00 PM at ET/PT.

Is the “401” Episode New?

The 401 episode of How Did They Build That? is all new!

How Did They Build That? 401 Cast & Stars

Main Cast

401 Episode Videos & Previews

Watch How Did They Build That? 401 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.