Extreme age

[wolram]

What man made structure (large scale) can endure the longest time, i am not thinking pyramid more an/or more oom longer.

[FredGarvin]

Ummm.....what? What do you consider "large scale?"

[wolram]

Ummm.....what? What do you consider "large scale?"

A home, a bridge, a habitable space vehicle.

[NoTime]

Build something on our moon.
Even a footprint stands a chance of lasting a few hundred thousand years.

Biggest problem would be the stray meteor going splat.

[wolram]

Build something on our moon.
Even a footprint stands a chance of lasting a few hundred thousand years.

Biggest problem would be the stray meteor going splat.

Yes a vacuum is a good preserver, i was thinking of some thing that has to withstand the elements, either on some planet or in space.

[NoTime]

Space is much the same as the moon if you have a stable orbit.

On a planet with weather and intelligent scavengers I would really tend to doubt that you would find any trace of tech in, say our civilization, after 5 to 10k years.
Perhaps the occasional rock pile and odd bit of ceramic.

In large areas of the world what currently exists isn't tremendously different from what you might have found 3000 years ago.

[FredGarvin]

It's pretty apparent from all of the artifacts ever found that stone is the way to go for longevity. Look at all of the Roman ruins that are still around.