Boldt Castle on Heart Island in Alexandria Bay, New York, was built at the turn of the 20th century and quickly abandoned after the sudden death of George C. Boldt's wife. In the 1970s, the castle became a public attraction. See more photos of the castles
Courtesy Boldt Castle
Hammond Castle —
Hammond Castle in Gloucester, Massachusetts, served as both home and laboratory for prolific inventor John Hayes Hammond Jr. after it was completed in 1929. See more photos of the castles
Courtesy Martinde/Wikimedia Commons
Castello di Amorosa —
This modern-day Napa Valley castle in Calistoga, California, took 14 years to construct using historically accurate medieval building techniques. See more photos of the castles
Brian Jannsen/AgeFotostock
Bishop's Palace —
Bishop's Palace in Galveston, Texas, was built from 1887 to 1892 for Santa Fe railroad magnate Walter Gresham. See more photos of the castles
Galveston Historical Foundation/David Canright
Fonthill Castle —
This 100-year-old Bucks County estate now serves as a museum to pre-industrial life in Doylestown, Pennsylvania. See more photos of the castles
Courtesy 2daysphotos.com
OHEKA Castle —
OHEKA in Huntington, New York, is second behind Asheville, North Carolina's Biltmore as the largest private estate in the nation. See more photos of the castles
Courtesy Oheka Castle
'Iolani Palace —
America's only true palace—as in, royalty resided here—was built from 1879 to 1882 in Honolulu by King Kalakua and Queen Kapi'olani. See more photos of the castles
