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From the Ellis Island World / Places
Castle Williams
See Castle Williams, the circular sandstone fort on Governors Island. Its first floor opens for self-guided visits during NPS hours; upper floors remain closed to the public.
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The thick circular walls show a different answer to harbor defense than nearby Fort Jay’s star-shaped plan. Walk around the exterior, then enter the first floor when NPS has the fort open. The visit fits into a longer island walk, with the upper floors remaining off limits.
What to look for
Circular red-sandstone exterior
First-floor self-guided exhibits
Useful to know
NPS lists Wednesday–Sunday, 10 a.m.–4 p.m.; check winter closure and construction alerts before travel.
Walk from the Governors Island ferry landing by public paths; upper floors are closed.
Your next visit
Estimated · Declared scenario and planning estimates; no live opening, weather, queue or booking service.
Outdoor visit · 20–35 min
World planning estimate; admission, opening, visit duration and access need checking.
