Very clean URIs
This page collects URIs that have no "cruft", meaning no ".cgi",".php",".asp","?","&","=" and the like, and are therefore not dependent on a finite or changeable technology, are less prone to change as infrastructure evolves, and are potentially more human-readable.
American Numismatic Society
http://numismatics.org/collection/1944.100.24110
American School of Classical Studies at Athens, Digital Collections
http://ascsa.net/id/agora/object/p%2034646
Ancient History Encyclopedia
http://www.ancient.eu.com/dacia/
Ancient World Digital Library
http://dlib.nyu.edu/awdl/books/dieplastikderg00fech
Aphrodisias in Late Antiquity
http://insaph.kcl.ac.uk/ala2004/inscription/eAla007.html
Arachne
http://arachne.uni-koeln.de/item/bauwerk/2100006
Art and Architecture Thesaurus Online (Getty Research)
http://vocab.getty.edu/aat/300301404
The Art of Making: Stoneworking in the Roman World
http://www.artofmaking.ac.uk/explore/monuments/264
Attic Inscriptions Online
http://www.atticinscriptions.com/inscription/IGII31/447
Biblioteca Apostolica Vaticana
http://digi.vatlib.it/view/MSS_Vat.sir.160
British Museum
http://collection.britishmuseum.org/description/object/WCT133702
Brooklyn Museum
http://www.brooklynmuseum.org/opencollection/objects/10044
Cuneiform Digital Library Initiative
Encyclopaedia Iranica
http://iranica.com/articles/Persepolis
Encyclopedia of Ancient History
http://dx.doi.org/10.1002/9781444338386.wbeah0919
Epigraphische Datenbank Heidelberg
http://edh-www.adw.uni-heidelberg.de/edh/inschrift/HD000009
Europeana
http://europeana.eu/portal/record/00401/AEBFF976BD6601A16F6C785EC1DF355AE7C60127.html
FACEM: Provenance Studies on Pottery
Geonames.org
http://www.geonames.org/110836/persepolis.html
Getty Museum Catalogues
http://museumcatalogues.getty.edu/amber/objects/1/
Historic England
https://historicengland.org.uk/listing/the-list/list-entry/1002984
Inscriptions of Roman Tripolitania
http://inslib.kcl.ac.uk/irt2009/IRT123.html
Internet Encyclopedia of Philosopy
http://www.iep.utm.edu/thales/
ISAW Papers
http://dlib.nyu.edu/awdl/isaw/isaw-papers/1
Jstor
http://www.jstor.org/stable/148266
Kenchreai Archaeological Archive
http://kenchreai.org/kaa/kcp/km014
Kyprios Character
http://kyprioscharacter.eie.gr/en/cyprus-coins/details/A1129
Levantine Ceramics Project
http://www.levantineceramics.org/wares/40
Lexicon of Greek Personal Names
http://www.lgpn.ox.ac.uk/name/Θουκυδίδης
Library of Congress (Authorites and Vocabularies)
Library of Congress (Catalog)
Metropolitan Museum of Art, New York
http://www.metmuseum.org/collection/the-collection-online/search/251114
Museum of Fine Arts, Boston
http://www.mfa.org/collections/object/16857
New York Public Library
http://digitalcollections.nypl.org/items/510d47e1-1622-a3d9-e040-e00a18064a99
Nomisma.org
OCIANA: Online Corpus of the Inscriptions of Ancient North Arabia
http://krc.orient.ox.ac.uk/ociana/corpus/pages/OCIANA_0037792.html
Online Catalog of Byzantine Coins
https://www.doaks.org/resources/coins/catalogue/bzc-2009.024
Online Coins of the Roman Empire
http://numismatics.org/ocre/id/ric.1(2).aug.1a
Open Context
http://opencontext.org/subjects/73221A18-7A7C-44C4-36CD-0CECF8F7A725
Papyri.info
Parthenon Frieze Repository
http://repository.parthenonfrieze.gr/frieze/handle/10442/sxliii
Penn Museum
http://www.penn.museum/collections/object/94416
Perseus Digital Library
http://data.perseus.org/people/smith:alexander-3
Persons and Names of the Middle Kingdom
https://pnm.uni-mainz.de/inscription/273
Pleiades
http://pleiades.stoa.org/places/550595
Portable Antiquities Scheme, UK
http://finds.org.uk/database/artefacts/record/id/412455
Princeton University Art Museum
http://artmuseum.princeton.edu/collections/objects/53083
repository.topoi.org
http://repository.topoi.org/BSDP/BSDP0006
Standards for Networking Ancient Prosopographies (SNAP:DRGN)
http://data.snapdrgn.net/person/100001
Stanford Encyclopedia of Philosophy
http://plato.stanford.edu/entries/plato/
Syriaca.org
Trismegistos
http://www.trismegistos.org/text/27080
VIAF: Virtual International Authority File
Vindolanda Tablets Online
http://vindolanda.csad.ox.ac.uk/TVII-291
The Walters Art Museum
http://art.thewalters.org/detail/15596
WikiData
http://www.wikidata.org/entity/Q17892
Wikipedia (English)
http://en.wikipedia.org/wiki/African_red_slip