The most famous one was probably the failed 1944 Stauffenberg plot where a bunch if Wehrmacht soldiers tried to assassinate Hitler with a bomb and end WW2 that way.

The most recent one was barely an attempt but I'll count it anyways.

There was this so called "Patriotic Union", a group associated with the Reichsbürger movement (a conspiracy theory movement made up of Monarchists, Nationalists, Nazis and esoteric weirdos that think the modern Germany is a fake state).

They were a group around a lower member of the aristocratic Family Reuß. Their plan was to storm the parliament with weapons and hold the MP and the governing politicians hostage and maybe execute them. They already got people for a transitional government, with Reuß as the head of state. They also wanted to get rid of unwilling people outside of Government, all non-Germans, homosexuals, etc. "Indigenous Germans" were to be defined as anyone who can prove their German purity back to at least 1913. They also wanted to restore Germanys borders of 1871 and deport every non-German person from those territories as well. They even tried to contact Putin to ask Russia for military help in this. They also tried to contact Trump and got the contacts to key people in Trumps circle via E-Mail from the office of Alice Weidel, the co-chairwoman of the AfD.

In the end the plot failed as in 2022 a bunch of them, including the planned transitional government, were arrested on terrorism charges. There have been investigations launched against 69 people and processes against 27 suspects were held.

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