Seen as a symbol of welcome to immigrants arriving by sea, this 305 foot high structure is made of iron and copper, and was a gift from France.

The four presidents on this monument were chosen to represent the nation's birth, growth, development, and preservation.

At the time of its opening in 1937, it was both the longest (4,200 feet) and the tallest (746 feet) suspension bridge in the world. It spans a strait connecting the San Francisco Bay and the Pacific Ocean.

This complex of Mayan ruins on Mexico's Yucatán Peninsula has a massive step pyramid, known as El Castillo or Temple of Kukulcan, in the ancient city, which thrived from around 600 A.D. to the 1200s.

This temple, built in the 12th century by the Khmer people, is the largest religious complex in the world. What historical landmark is this?

This massive stadium could seat 50,000 people for gladiator battles and other spectator events. What landmark is this?

This is the only one of Seven Wonders of the Ancient World that still stands today. They were pharaohs' tombs. What is it?

This structure stretches about 5000 miles and was built to keep invaders out. Which world landmark can be seen here?

It means ‘Old Mountain’ in the local Quechua language and was built three days' walk from the Inca capital of Cuzco as a retreat for the Inca leader. What famous ancient city in Peru is this?

This structure is thought to have been the treasury of which ancient city, which is carved into rocky cliffs?

Each individual block in this structure weighs about 25 tons and was moved up to 150 miles to the site. Its purpose is uncertain, but some believe it may have served as a burial monument. What is this circle called?

An emperor had this marble structure built as a memorial to his wife who had died. It stands on the riverbanks of the Yamuna River in Agra in northern India. What is it called?

This concrete statue, completed in 1931, stands 98 feet tall on the top of a mountain, overlooking one of South America's largest cities.