Another very popular choice for inground swimming pools is that of Gunite (also sometimes called concrete) pools. Gunite pools are very popular for commercial settings or elaborate large residential pools. Gunite is generally significantly more expensive then that of vinyl or fiberglass inground pools.
Many people prefer gunite because of the idea that is a perminant concrete structure on the property. Although these days many fiberglass and vinyl pools have lifetime warrenties (which may mean 25-100 years and should be checked into before buying).