Wentworth–Coolidge Mansion State Historic Site preserves the sprawling former residence of Benning Wentworth, who served as New Hampshire’s first royal governor from 1741 to 1767. Perched along the shores of Little Harbor in Portsmouth, this rambling 40-room colonial mansion offers a rare window into 18th-century political life and architecture unlike anything else in the state.

The mansion itself is the main draw — its unusual layout grew organically over decades as Wentworth added rooms for entertaining, governance, and family life, creating an almost maze-like floorplan that fascinates architecture buffs and history lovers alike. Guided tours walk you through period-furnished rooms while sharing stories of colonial power, lavish gatherings, and Wentworth’s controversial land grants that shaped New Hampshire’s borders.

Outside, the grounds are home to some of the oldest lilac bushes in North America, believed to have been planted around 1750. When they bloom in late May, the property transforms into a fragrant, photo-worthy spectacle — making late spring the best time to visit. The waterfront setting along Little Harbor adds a peaceful backdrop for strolling the grounds and taking in views of the tidal inlet.

This is a day-visit site rather than a camping destination, so plan accordingly. The mansion is typically open for tours from late spring through early fall, with limited hours. Pair a visit with nearby attractions in Portsmouth’s historic seaport district, just minutes away, for a full day of exploring New Hampshire’s colonial heritage.

Explore Nearby

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• Portsmouth Harbor Light — Lighthouse in New Hampshire
• Kancamagus Scenic Byway — Scenic Byway in New Hampshire
• White Mountain National Forest — National Forest in New Hampshire, Maine
• White Mountain Trail — Scenic Byway in New Hampshire