AntiqueMicroscopes.co.uk documents a private microscope collection alongside maker histories, trade catalogs, serial-number research, scientific instruments, and an image database for identifying old equipment.
Carmen Giunta's Classic Chemistry site has been putting foundational chemistry papers, historical calculations, obsolete terminology, anniversaries, and source-based teaching material online since the 1990s.
NASA's Astronomy Picture of the Day archive began in June 1995 and still exposes decades of astronomy outreach as a giant chronological list of ordinary web links.
The Primary Water Institute is a surviving example of the Web as a home for minority scientific claims: a polished advocacy archive arguing that large usable water supplies rise from deep within Earth rather than mainly coming from precipitation-fed groundwater.
The Millennium Simulation Project paired one of the largest cosmology computations of its era with a brutally practical web page full of DivX movies, giant images, PostScript posters, and downloadable galaxy catalogues.
Boris Behncke's Italy's Volcanoes has been online since 1995 and was intentionally left largely in its old form, preserving a specialist geology site instead of repeatedly redesigning it into oblivion.
Russell Hoffman's Internet Glossary of Nuclear Terminology is a sprawling 2002 web primer on reactors, radiation, nuclear weapons, waste, downwinders, the fuel cycle, and the politics surrounding them.
Kevin Dunn's old Chemistry 104 site organized chemistry around landmark technologies, asking students to make fire, metals, paper, soap, batteries, glass and other products instead of only reading about them.
Philip Gibbs's 1996 Physics FAQ page compresses a subtle question about rods, dark adaptation and photon detection into the kind of compact scientific explanation the early Web did exceptionally well.
NASA still hosts pages from POLAR, a late-1990s and early-2000s experiment that searched for large-scale polarization in the cosmic microwave background with a ground-based microwave radiometer.