North America · United States

Castillo de San Marcos

bastioned coastal fort · Tier A · verified

Built by Spain at St. Augustine from 1672 to 1695, the Castillo is a four-bastion coquina fort on Matanzas Bay. Its shellstone masonry, dry moat and layered outer works record changing plans and repairs across several centuries; the 1677 construction plan and modern aerial view show different moments in that history.

Photographs & plans

Country

United States

Coordinates

29.89778, -81.31139

Reported date

1672–1695 (initial construction); later work 1738–1740, 1752–1756, 1762

Condition

Intact; historic fabric preserved

Current use

National monument and museum

Research confidence

verified. Historically sourced profile; the on-page 3D scene remains a phase-aware visualization, not a metric or photogrammetric reconstruction.

Sources

• https://www.loc.gov/item/fl0095/
• https://www.loc.gov/resource/hhh.fl0095.sheet/?sp=12
• https://www.nps.gov/casa/learn/historyculture/who-built-the-castillo.htm
• https://www.nps.gov/casa/learn/historyculture/coquina.htm
• https://www.nps.gov/casa/learn/historyculture/dry-moat.htm
• https://www.nps.gov/casa/learn/historyculture/cultural-landscapes.htm

This catalogue entry is a research record. Unknown fields are left unknown; a star-shaped outline alone does not establish date, origin, or function.