OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 24 shown for “Limestone altar” — 64 records examined, 21 dropped by the rights gate.
Archives queried 2026-08-30 16:04 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Limestone altar
Artist not stated in the record · late 5th century BCE
Agave fortiflora Gentry
Artist not stated in the record · 23 Mar 1952
Limestone altar or pedestal with coiled snake
Artist not stated in the record · 5th century BCE
Two projects for a portable pulpit for the church in Offida
Artist not stated in the record · 1750–1800
Altar
Artist not stated in the record · ca. 232
An Altar Over a Crypt
Giuseppe Valadier, Italian, 1762–1839 · 1775
Limestone altar
Artist not stated in the record · 1st half of 5th century BCE
Elevation of an Altar
Artist not stated in the record · 1700–1730
Limestone altar
Artist not stated in the record · 5th–4th century BCE
Fixed kneeling altar from Saint Augustine Catholic Church of New Orleans
Artist not stated in the record · 20th century
Altar
Artist not stated in the record · late 12th century
Altar
Giuseppe Valadier, Italian, 1762–1839 · 1775
Limestone incense burner on four legs
Artist not stated in the record · 6th century BCE
Project for the modernization of an altar
Luigi Voghera, Italian, 1788 - 1840 · ca. 1830
Shield Bearer with the Ducal Arms of Saxony
Hans Daucher · ca. 1520
Design for an Altar
Gilles-Marie Oppenord, French, 1672–1742 · 1749-1761
Six Apostles from Retable
Artist not stated in the record · late 14th century
Fixed kneeling altar from Saint Augustine Catholic Church of New Orleans
Unidentified · 20th century
Chapel from Notre-Dame-du-Bourg at Langon
Artist not stated in the record · after 1126
Design for an Altar
Gilles-Marie Oppenord, French, 1672–1742 · 1749-1761
Limestone funerary relief
Artist not stated in the record · ca. 325–300 BCE
Project for a cross-altar: intended to be executed primarily with colored marbles
Artist not stated in the record · 1700–1730
Limestone votive head
Artist not stated in the record · 3rd–1st century BCE
Stage Design, Altar in Egyptian Temple
Artist not stated in the record · ca. 1825
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 45 matched · 24 examined · 1 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 22451 matched · 40 examined · 20 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-08-30 16:04 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.