Jefferson County

New York

A historic stone castle on a lakeside island with a clear sky.
A stone castle with towers on a lakeside island, surrounded by trees and a larger building in the background.
A stone castle with multiple towers by a calm lake, surrounded by lush greenery and a partly cloudy sky.
A historic mansion with a red roof and stone towers by a lake.
A stone structure with a statue on top by a waterfront.

Popular cities in Jefferson County

A historic stone castle on a lakeside island with a clear sky.
Alexandria Bay
Known for Castle, Historical and Rivers
Come to Alexandria Bay and enjoy its island views, castle and history.

Reasons to visit

  • Boldt Castle
  • Scenic View Park
  • Keewaydin State Park
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A cityscape with a mix of historic and modern buildings, a prominent church steeple, and a large open park area.
Watertown
Known for Shopping, Dining and Sports
Escape to Watertown! Enjoy its baseball, university life and history.

Reasons to visit

  • Fort Drum
  • Thompson Park
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A snow-covered town with a mix of residential and commercial buildings, a clear sky, and distant hills.
Clayton
Known for Friendly people, Rivers and Ports
Explore Clayton: its riverfront, coffee, sunsets and more!

Reasons to visit

  • Grass Point State Park
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A suspension bridge over a calm river, surrounded by dense forest.
Wellesley Island
Known for Islands, Castle and Historical
Trip time! Discover the island views, castle and hiking in Wellesley Island.

Reasons to visit

  • Wellesley Island State Park
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A town with a prominent clock tower, a lake, and autumn foliage.
Cape Vincent
Known for Friendly people and Rivers
Explore Cape Vincent: its riverfront and more!
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A coastal landscape with a lighthouse, white houses, and a ship in the distance.
Sackets Harbor
Known for Dining, Ports and Lakes
Trip time! Discover the local cuisine and lake views in quaint Sackets Harbor.
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Stay near popular Jefferson County attractions

A historic stone castle on a lakeside island with a clear sky.

Boldt Castle

9.4/10 (1,063 reviews)
After visiting Boldt Castle, make a plan to see the other sights and activities in Alexandria Bay. Amble around the area's riverfront or seek out the local tours.
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