How Did They Build That? “403” S4E3 August 10 2025 on Smithsonian

On Sunday August 10 2025, Smithsonian broadcasts How Did They Build That?!

403 Season 4 Episode 3 Episode Summary

The upcoming episode of “How Did They Build That?” titled “403” promises to be an exciting exploration of remarkable structures. This episode will air on Smithsonian and will focus on the incredible feats of engineering that have pushed the limits of structural concrete.

Viewers can expect to see a range of amazing buildings, bridges, and lifts that showcase the creativity and skill of engineers and architects. Each structure tells a story of innovation and determination, highlighting how concrete has been used in new and surprising ways.

The episode will delve into the challenges faced during the construction of these impressive structures. It will reveal how engineers overcame obstacles and used cutting-edge techniques to achieve their goals. With stunning visuals and informative commentary, “403” aims to inspire a deeper appreciation for the art and science of building.

Overall, “How Did They Build That?” continues to engage audiences with fascinating insights into the world of construction. Episode “403” is set to be a captivating look at how human ingenuity has shaped the environment through concrete engineering.

What Time is the “403” Episode On?

The 403 episode of How Did They Build That? will be broadcast on August 10 2025 on Smithsonian at 9:00 PM at ET/PT.

Is the “403” Episode New?

The 403 episode of How Did They Build That? is all new!

How Did They Build That? 403 Cast & Stars

Main Cast

403 Episode Videos & Previews

Watch How Did They Build That? 403 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.