A beach house is a residence on or near a beach that is occasionally used as a vacation or second home by people who commute to the house on weekends or during vacation seasons. Sculptural beach homes were developed by American architect Andrew Geller in the coastal districts of New England during the 1950s and 1960s. These homes use large amounts of glass, often with ocean views, for their exterior walls. Beach houses can either be built on pilings or jetties, or directly into the sand. Those built onto piers need not worry about high tides washing over their dunes, but those built into the sand may be affected by the tide. Beach houses range from small cottages to large mansions; some have several bedrooms and many have more than one bathroom. They usually have between 15 and 40 feet of frontage along the beach, but some have much more space for parking cars or for walking along the shoreline. Beach houses are generally priced lower than similar properties elsewhere because of their proximity to the water. However, like other kinds of houses, they also tend to cost more to build (because of all the fresh water inside them) and less to maintain (since they don't require any landscaping). There are different types of beaches around the world with different characteristics. For example, there are sandy beaches and rocky beaches.