City (pop., 2000: 594,056), capital of Aguascalientes state, Mexico.
Located on the Aguascalientes River, it was founded as a mining settlement in 1575 and became the state capital in the 1850s. It is sometimes called La Ciudad Perforada ("The Perforated City") because of an underground labyrinth of tunnels built by an unknown pre-Columbian people. It is an agricultural centre, with several industries. Several notable churches possess outstanding examples of colonial religious art.