I'm going with the space shuttle.
I was snowbirding near Daytona prior to bike week 7 or 8 years ago and happend to be there for a pre-dawn launch. I was about 40 miles away and even from that distance it was awe-inspiring. I could see the glow of the burners climbing through the tree line and it was probabley a mile up when it cleared the tree line. At that point all I could see was the burners and the exhaust trail, looking like an expanding gray thunderstorm. After a minute of that visual, the shuttle hit the dawn horizon line and the shuttle now appeared as a silvery glint ahead of the exhaust plume, which became in the sunlight more like a roll of vanilla cotton candy being contstantly un-rolled. I was even able to see the booster rockets detach and fall for a while, themselves also twinkling in the dawn sun.
This was all set against a clear sky in silence. As the shuttle got to the point where it couldn't be seen with the naked eye any longer, that's when the sound came. It started softly at first and very deep in tone, like distant thunder. It stayed as a deep bass tone as it continued to grow louder and louder, taking a minute perhaps to reach full volume. The birds in the trees flew away in fright. I could feel the walls of the bike trailer I was leaning against vibrating as it stayed at volume for at least 2 minutes. Nothing else could be heard, except for the deepest bass tone/rumble that the rocket engines had made.
Then the sound subsided and all that was left was the graceful arc of the exhaust plume, pointing the way to the stars.
And this was from about 40 miles away! I'm going with the space-shuttle as a modern-marvel.
Tri(Iplay bass and I likes it)umph