Castello Aselmeyer, also known as Castello Grifeo, is a historic building in Naples, Italy, designed by architect Lamont Young. Built between 1899 and 1902, it was originally intended as a hotel but later became the private residence of banker Carlo Aselmeyer. The castle features a unique blend of neogothic and Tudor architectural elements, with a medieval-inspired design that includes pointed arches, protruding towers, and intricate wooden interiors. Today, the building is divided into multiple private apartments, showcasing the architect's innovative style and attention to detail.