Lost Inca city complex, probably built in the 15th century; perched on a mountainside about 7,550 feet above sea level; it's purpose and history are shrouded in mystery; the Inca built their living quarters, temples and workshops out of large stones so precisely hewn that they were able to do without mortar; the transport of the huge stones was another astonishing achievement; found by American adventurer Hiram Bingham (probably the original Indiana Jones) in 1911.

Built by Shah Jahan for his wife, after she died giving birth to her fourteenth child, as her tomb, intended as a memorial to everlasting love; built between 1632 and 1652 by around 20,000 people; a masterpiece of technology, the dome is 213 feet high and 92 feet wide, and rises above a cylindrical lower construction; the building is flanked by additional cupolas, turrets and slender minarets and built out of marble richly decorated with intarsia made of semi-precious stones.

30,000 workers and all the major artists in France worked to create this palace, which was built as a royal home for King Louis XIV, beginning in 1668; took 50 years and 500 million gold francs to build; approximately 3,000 people lived in the palace, observing strict etiquette of the court, and all organized according to their place in the hierarchy; a garden landscape of over 3 square miles surrounds the palace.

Church set in the center of the Spanish city of Barcelona; architect Antoni Gaudi devoted 30 years of his life to the building of this church, which may not be completed until 2050; it is built in the art nouveau style with an abundance of symbolism incorporated into the design; the highest tower is planned to soar 558 feet into the sky.

Building started 1340 to house the councillors who governed Venice; the Doge's Palace was a place for grand receptions and ceremonies, with paintings by the great Venetian masters, set in elaborate guilded frames; construction continued until the 17th century; the facade is characterized by the contrast between the two lower floors--with delicate columns and keel arches broken with tracery--and the upper floor--completely covered with lancet windows set in red and white marble.