Castle Island
One of five peninsulas in Boston Harbor — an island until the causeway joined it to South Boston in 1928 — Castle Island holds the oldest fortified site in British North America, in use since 1634. The grounds cover 22 acres, with a little more than two miles of walking trails.

Part of the connected record of this place — 1 relationship link it into the wider graph, each one a thread worth pulling.
Open the full civic recordCurrent pulse, routes, recommendations, and memory
Now, then, future
Every object is temporal: what it feels like now, what it used to mean, and what it can become next.
quiet enough to notice details. Best now: one good detour.
The older layer is mostly carried by nearby places and relationships.
2026: America’s 250th — July 4, 2026.
How it feels right now
Indoor escapes within a few blocks.
Coffee, libraries, bookstores, and campus edges.
How strongly the nearby graph reads as campus life.
Fame, landmark pull, and visitor-facing assets.
Older records and historical edges around this object.
Different kinds of things hiding within a short walk.
Routes with a point of view
Chosen moves from here
Human recommendations
- Online
- Official site ↗
- Graph connections
- 1
In the graph 1 relationships — first-class data, not links
Explore Castle Island in the interactive Graph Explorer — click to expand every connection →Nearby what sits within a few minutes’ walk
Castle Island & Fort Independence
Fort Independence - Castle William
Castle Island is linked, through the graph, to Boston — city, 2.9 mi away. The kind of thread you only find by following the connections.
Keep exploring graph-powered — every path below is a real relationship, not a guess
One record, 1 framing cross-property publishing — never duplicated
How we know graph confidence — we explain our certainty, not just assert it
Schema.org JSON-LD — what answer engines read
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "LandmarksOrHistoricalBuildings",
"@id": "https://boston400.com/e/landmark-castleisland-4526b",
"name": "Castle Island",
"description": "One of five peninsulas in Boston Harbor — an island until the causeway joined it to South Boston in 1928 — Castle Island holds the oldest fortified site in British North America, in use since 1634. The grounds cover 22 acres, with a little more than two miles of walking trails.",
"url": "https://boston400.com/e/landmark-castleisland-4526b",
"image": {
"@type": "ImageObject",
"url": "https://www.nps.gov/common/uploads/cropped_image/AD16871E-0FF6-9230-859AF85241E944EC.jpg",
"contentUrl": "https://www.nps.gov/common/uploads/cropped_image/AD16871E-0FF6-9230-859AF85241E944EC.jpg",
"creditText": "Wikimedia Commons",
"caption": "Castle Island"
},
"geo": {
"@type": "GeoCoordinates",
"latitude": 42.33786,
"longitude": -71.01099
},
"mainEntityOfPage": "https://www.nps.gov/places/castle-island.htm",
"sameAs": [
"https://www.nps.gov/places/castle-island.htm"
],
"citation": [
{
"@type": "CreativeWork",
"name": "U.S. National Park Service (NPS API)"
}
],
"containedInPlace": {
"@id": "https://boston400.com/e/boston"
},
"relatedLink": [
"https://boston400.com/e/boston"
]
},
{
"@type": "City",
"@id": "https://boston400.com/e/boston",
"name": "Boston",
"url": "https://boston400.com/e/boston"
}
]
}