You can’t drive to 5 iconic US landmarks — and that’s what makes them unforgettable

Seaplane photography in the Dry Tortugas(iStock)

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Fort Jefferson rises from the warm, turquoise waters of the Gulf of Mexico about70 miles west of Key Westand can only be reached by ferry, private boat or seaplane.Built with more than 16 million bricks in the 19th century, it remains the largest masonry structure in the United States.

Visitors canstroll its massive ramparts, explore the moat walls and snorkel in surrounding reefs, often with fewer crowds thanks to its remote location, according toTravel + Leisure.

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2.Apostle Islands National Lakeshore—Wisconsin

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The Apostle Islands National Lakeshore is a 21-island archipelago located inWisconsin’s Lake Superiorknown for its stunning sandstone sea caves, historic lighthouses and over 50 miles of hiking trails.The destination boasts one of the largest collections of historic lighthouses in North America, according toBoatmart.

The Apostle Islands in Lake Superior are known for sea caves, historic lighthouses and rugged shorelines best explored by boat or kayak.(Erin Hooley/Chicago Tribune/Tribune News Service)

Primarily accessible by water — via kayak, tour boat or ferry — the park offerscamping, fishing and sailing, with peak season running from May to October.

3.Thomas Point Shoal Lighthouse—Maryland

Chesapeake Bay near Annapolisdates to 1875 and once guided ships through the bay’s shallow waters.Built on iron pilings drilled into the seabed to anchor it in soft sediment, it is the last screw-pile lighthouse in the area still in its original location, according to the National Park Service (NPS).

Thomas Point Shoal Lighthouse, a historic screw-pile structure in the Chesapeake Bay, can only be viewed up close by boat.(Pouya Dianat/The The Washington Post)

Visitors can get a close-up view by boat but docking is restricted to help preserve the structure.

4.Fort Massachusetts, Ship Island—Mississippi

Fort Massachusetts sits about 12 miles off the Mississippi Gulf Coast and offers a glimpse into Civil War-era history.(iStock)

The unfinished fort was seized by Mississippi militia forces in early 1861, marking one of the earliest actions leading into the Civil War.

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Ferries run regularly, butprivate boaterscan discover a more secluded experience that feels far removed from mainland crowds.

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5.Isle Royale National Park—Michigan

Isle Royale National Park offers remote wilderness, hiking trails and wildlife in Lake Superior.(iStock)

Isle Royale is ideal for travelers seeking true isolation.Located in Lake Superior near the Canadian border, the park is only accessible by boat or seaplane and has no roads.Instead, visitors find miles of hiking trails, ancient mining pits,remote campsites,the seasonal Rock Harbor Lodge and wildlife including moose and wolves.

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The extra effort required to get there limits visitor numbers, offering a rare sense of solitude in the national park system, according to Travel + Leisure.