The sites listed below illustrate the history of tabby and the Spanish colony in St. Augustine:
Mission de Nombre de Dios
It is here on Mission Grounds in 1565 that Pedro Menéndez de Avilés landed and began the Spanish colony in Florida. A marker in the historic park indicates the location of the oldest known tabby and coquina—the foundations of a church and friary dating from 1677. Unfortunately, archaeologists have covered the ruins, so only the marker is visible.
Address: 27 Ocean Avenue, St. Augustine, FL 32084
Accessibility: The mission is open to the public and consists of a museum, church, chapel, and historic park (although the archaeological excavation is covered and unavailable for public viewing). For more information, visit the website of the Mission de Nombre de Dios.
Castillo de San Marcos
Constructed 1672-1695, the massive Castillo de San Marcos is the oldest standing fort in the United States. It was built primarily with coquina, but some tabby was used. (However, it seems to me that in St. Augustine the floors identified as tabby have much smaller and fewer shells than tabby elsewhere.)
GPS: N 29°53.798 and W 81°18.676
Address: 1 S. Castillo Drive, St. Augustine, FL 32084
Accessibility: There is a parking lot in front of the fort and at the nearby Visitor Center. Open every day, except Christmas, from 8:45am-4:45pm. Admission is $7 for those over the age of 15. For more information see the website for the Castillo de San Marcos National Monument.
St. George Street Tabby Walls
St. George Street is a popular pedestrian walkway with stores and restaurants in the heart of the historic district. Most of the tabby walls along historic St. George Street are stuccoed, but exposed tabby can be seen in a couple of spots.
One wall is by the Oldest Wooden Schoolhouse in the U.S. at 14 St. George Street and Tolomato Lane
(GPS Coordinates N 29°53.847 and W 81°18.818).
Another is by Mill Top Tavern at 19 St. George Street
(GPS Coordinates N29°52.824, W81°18.809).
Park at the nearby Visitor Center, which is also close to the Castillo San Marcos. The Visitor Center is located off I-95 at 10 W. Castillo Dr, St Augustine, FL 32084. For more information, see http://www.staugustinegovernment.com/sites/vicparking/index.cfm.