Biodiversity Heritage Library
biodiversitylibrary.org
Every natural history book, scanned by the world's museums
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Deep Archives
Peer-reviewed world history, free and properly illustrated
worldhistory.org
Rabbit hole · Works anywhere
Free, no sign-up · online since 2009
Founded as the Ancient History Encyclopedia and renamed once its coverage grew well past antiquity, this non-profit publishes fact-checked articles alongside close to twenty thousand illustrations, plus videos, maps, timelines and 3D models. Historians write the entries and reviewers check them before publication.
Articles close with their sources and the name of the reviewer, so the site holds up as a citation in a way that a general-purpose wiki does not.
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Picked for a shared category and overlapping vibe, not for popularity.
biodiversitylibrary.org
Every natural history book, scanned by the world's museums
davidrumsey.com
A hundred thousand old maps, zoomable to the street
indianculture.gov.in
India's national collections, digitised into one place
rekhta.org
The largest Urdu poetry archive, readable in three scripts
rijksmuseum.nl
Download a Vermeer at a resolution you can actually print
si.edu
Millions of museum objects, released with no restrictions