S
Sander
Oct 2026
“Leiden is verrassend mooi! Tip; maak de Nederlandse versie”
The Keeper of Leiden’s KeysBased in Leiden, NL · Member since Jul 2026
Detailed historical facts and mysteries of Leiden!
Sander
Oct 2026
“Leiden is verrassend mooi! Tip; maak de Nederlandse versie”
The Keeper of Leiden’s KeysFreya m
Sep 2026
“Learnt a lot. The physics history was very interesting and not something we would have found on our own. Some of the challenges didn’t have clues to the answers. Eg Descartes servant and the good woman’s poison.”
The Keeper of Leiden’s KeysKerr,,
Jul 2026
“vibe: we vonden de feitjes niet allemaal heel leuk. we vonden sommige instructies wel onduidelijk.”
The Keeper of Leiden’s KeysDiscover Inkroost's self-guided walking tours