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

For immoderate of America’s astir memorable question experiences, getting determination is portion of the adventure.

From distant nationalist parks to historical Civil War-era forts, immoderate of America’s astir iconic destinations tin lone beryllium reached by vessel — nary crowded parking tons oregon missed road exits required.

With America’s 250th day approaching, present are 5 iconic U.S. destinations you tin lone scope by vessel — or, successful immoderate cases, seaplane — and wherefore they’re worthy the journey.

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1. Fort Jefferson — Dry Tortugas National Park, Florida

Seaplane photography successful the Dry Tortugas (iStock)

Fort Jefferson rises from the warm, turquoise waters of the Gulf of Mexico astir 70 miles westbound of Key West and tin lone beryllium reached by ferry, backstage vessel oregon seaplane. Built with much than 16 cardinal bricks successful the 19th century, it remains the largest masonry operation successful the United States.

Visitors tin stroll its monolithic ramparts, research the moat walls and snorkel successful surrounding reefs, often with less crowds acknowledgment to its distant location, according to Travel + Leisure.

2. Apostle Islands National Lakeshore — Wisconsin

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The Apostle Islands National Lakeshore is simply a 21-island archipelago located successful Wisconsin’s Lake Superior known for its stunning sandstone oversea caves, historical lighthouses and implicit 50 miles of hiking trails. The destination boasts 1 of the largest collections of historical lighthouses successful North America, according to Boatmart.

The Apostle Islands successful Lake Superior are known for oversea caves, historical lighthouses and rugged shorelines champion explored by vessel oregon kayak. (Erin Hooley/Chicago Tribune/Tribune News Service)

Primarily accessible by h2o — via kayak, circuit vessel oregon ferry — the parkland offers camping, sportfishing and sailing, with highest play moving from May to October.

3. Thomas Point Shoal Lighthouse — Maryland

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This cottage-like lighthouse located successful the Chesapeake Bay adjacent Annapolis dates to 1875 and erstwhile guided ships done the bay’s shallow waters. Built connected robust pilings drilled into the seabed to anchor it successful brushed sediment, it is the past screw-pile lighthouse successful the country inactive successful its archetypal location, according to the National Park Service (NPS).

Thomas Point Shoal Lighthouse, a historical screw-pile operation successful the Chesapeake Bay, tin lone beryllium viewed up adjacent by boat. (Pouya Dianat/The The Washington Post)

Visitors tin get a close-up presumption by vessel but docking is restricted to assistance sphere the structure.

4. Fort Massachusetts, Ship Island — Mississippi

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About 12 miles disconnected the Mississippi Gulf Coast, Fort Massachusetts offers a glimpse into Civil War history. The D-shaped ceramic fort, wherever operation began successful 1859, features cannons, arched corridors and grass-covered walls for visitors to explore, according to the National Park Service.

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

The unfinished fort was seized by Mississippi militia forces successful aboriginal 1861, marking 1 of the earliest actions starring into the Civil War.

Ferries tally regularly, but backstage boaters tin observe a much secluded acquisition that feels acold removed from mainland crowds.

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5. Isle Royale National Park — Michigan

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

Isle Royale is perfect for travelers seeking existent isolation. Located successful Lake Superior adjacent the Canadian border, the parkland is lone accessible by vessel oregon seaplane and has nary roads. Instead, visitors find miles of hiking trails, past mining pits, distant campsites, the seasonal Rock Harbor Lodge and wildlife including moose and wolves.

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The other effort required to get determination limits visitant numbers, offering a uncommon consciousness of solitude successful the nationalist parkland system, according to Travel + Leisure.