Field file 19 · Military · Florida
Fort Jefferson
Dry Tortugas, Florida · Gulf of Mexico · Island fortress
Record
Why it matters
A massive unfinished coastal fortress rising from Garden Key, far beyond the end of the Florida Keys.
Field note
The remoteness is real. Ferry and seaplane access require advance planning, water awareness, and respect for park rules.
Evidence line
This file is marked Documented because the place and its history are supported by the linked authoritative source. Practical details were last checked in July 2026. Conditions change. Check the primary source before leaving home.
Access
How to approach it lawfully
Remote marine environment. Carry water and follow all park guidance.
- Access status
- Ticketed. Public access with paid admission or a required ticket. Recorded as: Boat or seaplane.
- Reservation
- Ferry and seaplane access require advance planning.
- Seasonality
- No seasonal limit recorded. Hours still change; check before traveling.
Practical details last checked July 2026. Conditions change. Check the primary source before leaving home.
Plan the stop
What to plan for
- Time
- Full day
- Cost
- Transport and park fees (Fee or pass)
- Terrain
- Remote marine environment.
- Mobility
- Not recorded in this file. Check the official source.
- Parking
- Not recorded in this file. Check the official source.
- Weather
- Not recorded in this file. Check the official source.
Directions to the public entrance Opens Google Maps with these coordinates. The provider sees them under its own privacy policy. Confirm the entrance against the official source first.
Record
Sources
- Primary sourceNational Park Service , opens in a new tab
Sources are summarized in the Atlas's own words and checked on the dates shown. See the methodology, or send a correction.
Road file
Carry it forward
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Book the tour, not the trouble.
No partner link on this file. Use the official source for tickets and tours. How partner links work.