What are your favorite engineering marvels?

[UberEatsDriver]

Tunnels (boring machine) and subways

Tunnels - having a system underground makes outside look beautiful and no fumes. Crazy highways and street level elevated trains are ugly.



Subways - point A to point B with no traffic. Can use railroad lines and can also travel underground.



Tunnel boring machine. Crushing the earth below to allow deeper tunnels

 

[cheek100]

When they invented Pipe Bursting plumbers lost their minds
U can now replace a sewer or water line underground without digging a trench. Homeowners love it bc it doesn’t disturb the landscaping. What was once a long, invasive and messy job is now neat and clean.
Still got to have deep pockets tho

 

[Vandelay]

Good thread idea. Will circle back.

Easy answer, indoor plumbing.