No passport required for this list of ten castles to visit right here in the US shared by TravelZoo. Thanks to JT for the link!
Top 3 below and full listing here.
Boldt Castle, New York
In one of the most lovely displays of modern romance (and wealth), construction on Boldt Castle began in 1900 by Waldorf-Astoria hotel founder George Boldt as a tribute to his wife. Yet, when Louise Boldt passed away months before completion, all construction halted for 70 years — it was only when the Thousand Island Bridge Authority acquired the property in 1977 that the project resumed and was ultimately completed. Today, Boldt Castle offers daily tours and is a popular wedding venue.
Castello di Amorosa, California
Although Castello di Amorosa only lowered its drawbridge in 2007, the castle and winery are authentic replicas of the traditional buildings found in 13th-century Tuscany. Features include a 500-year-old fireplace, a Great Hall with replica Tuscan fresco paintings, a dungeon (yes, really), and an impressive wine barrel room with ancient Rome-inspired cross-vaulted ceilings. General admission includes free-range roaming access to the property as well as wine tastings, while guided tours and tastings, pairing programs, and transportation packages are also available.
Castle in the Clouds, New Hampshire
Also known as the Lucknow Estate, this mega-mansion was built by shoe manufacturing millionaire Tom Plant and his wife, Olive Plant, in the early 1900s. Named for its location high in the Ossipee Mountain Range, the property was opened to the public in 1959 and is currently managed by the Castle Preservation Society, which has helped the estate remain an authentic portrait of 20th-century life. The estate hosts a rich lineup of events, is the venue for many weddings every year, and boasts an on-site restaurant.
Check out the remaining 7 that made their favorite list here, as well as nearby lodging recommendations.