Welcome to Wentworth by the Sea, a Marriott Hotel & Spa Recently named the Best Resort/Hotel Spa by New Hampshire Magazine's 2017 Best of NH! Overlooking the Atlantic Ocean from the island of New Castle, Wentworth by the Sea, a Marriott Hotel & Spa, welcomes guests to one of last grand Portsmouth hotels. Our AAA Four-Diamond retreat features the three original Victorian towers constructed in the 1870s, along with 161 stately guest rooms and suites that blend the hotel’s historic elegance with luxurious, modern amenities. An ideal destination for romantic getaways, family vacations and groups planning a New Hampshire vacation, Wentworth by the Sea is just an hour north of Boston yet offers the tranquility of a remote seaside sanctuary. Here, everything from pampering spa treatments to fresh, imaginative cuisine sets the stage for a truly unforgettable experience. With 10,000 square feet of flexible function space, Wentworth by the Sea is also the premier choice among Portsmouth hotels for meetings and special events. Discover the timeless elegance and grace that have drawn guests here for over a century.