You could be sitting under a hefty stack of brochures, catalogs, and pamphlets suggesting sumptuous trips to far-off spots, the sorts of sparkly locations that, quite often, feature fabulous castles.

There is something deeply magnetic about a locked door, a sealed wall, or a staircase that vanishes into silence. Castles have stood for centuries as symbols of power and grandeur, but behind their ...

Oheka Castle, which helped inspire "The Great Gatsby," is the second-largest private home in the US.