Lenin in Zürich

Lenin spent a year in Zürich while writing his book.

If you wander down a tiny street in the Altstadt (old town), you may come across a nondescript historical marker indicating that “Lenin lived here.”

A residence of Lenin when he was living in Zurich.

Indeed, it turns out that Lenin and his wife lived here for a year, 1916-17, while he worked on his book, Imperialism, the Highest Stage of Capitalism. A nearby marker gives more details:

A residence of Lenin when he was living in Zurich.

For more, see here and Wikipedia.