Spain’s principal archaeological museum spent more than 6 years redesigning its 19th-century home and its exhibits. The result is magnificently stylish. Spain recognized early on the value of its buried culture and succeeded in keeping most of its treasures inside the country. They range from the intriguing Celto-Iberian statues La Dama de Elche and La Dama de Baeza, which date from the 4th century B.C., to a wealth of Roman sculpture and mosaics, jeweled Visigothic crowns and crosses, and intricate Islamic art. There is also a reproduction of the cave paintings of Altamira.