A dollhouse or doll's house is a toy home made in miniature. Since the early 20th century dollhouses have primarily been the domain of children, but their collection and crafting is also a hobby for many adults. English-speakers in North America commonly use the term dollhouse, but in the United Kingdom and other English-speaking countries the term is doll's house (or, less commonly, dolls' house). They are often built to put dolls in. The history of today's dollhouses can be traced back about four hundred years to the baby house display cases of Europe, which showed idealized interiors. Smaller dollhouses with more realistic exteriors appeared in Europe in the 18th century. Early dollhouses were all hand made, but following the Industrial Revolution and World War II, they were increasingly mass-produced and became more standardized and affordable. Dollhouses can range from simple boxes stacked together used as rooms for play, up to multi-million dollar structures displayed in museums. Contemporary children's play dollhouses are mostly in 1:18 (or 2/3") scale, while 1:12 (or 1") scale is common for dollhouses made for adult collectors. Miniature homes, furnished with domestic articles and resident inhabitants, both people and animals, have been made for thousands of years. The earliest known examples were found in the Egyptian tombs of the Old Kingdom, created nearly five thousand years ago. These wooden models of servants, furnishings, boats, livestock and pets placed in the Pyramids almost certainly were made for religious purposes. The earliest known European dollhouses were the baby houses from the 16th century, which consisted of cabinet display cases made up of individual rooms. The term “baby” in baby house is coined from the old English word meaning doll. Dollhouses of this period showed idealized interiors complete with detailed furnishings and accessories. The cabinets were built by hand with architectural details, filled with miniature household items and were solely intended for adults.