I watched a show that asked this question. The undisputed champ was Hoover damn Mt. Rushmore with an estimated expected life of hundreds of thousands of years.
Hoover Dam is also expected to last a long time. The forces on the structure are mainly compression and it isn't a seismically active area. The big question is whether the electricity generating turbines would fail open or shut.
Any metal parts will eventually corrode. Even if they start closed, they will eventually "open". The only parts that will remain after thousands of years are the cement parts.
No. It was one of those History Channel (maybe TLC or Discovery) thought experiment shows like "what would happen if all humans disappeared". The dogs was a hard watch. I didn't need to think about doggos starving to death at home as they waited for their humans to return. Strong Futurama's Jurassic Bark feels.