Inca

Inca was not the name of the people, rather "Inka" was the title of the ruler.  The Spanish mistakenly called the people this title.  The people of the Inca referred to their empire as Tawantinsuyu, which meant "four parts together," as the empire was divided into four major administrative centers.
Inca gold representation of the Sun god.  As with the Aztec's, gold was so plentiful in the Inca Empire it had little value except to make into pieces of art, both religious and for personal use.
Inca silver ancestor gods.

Inca gold cup with the Sun god Inti. The vast treasure in silver and gold art works of the Inca drew the avarice attentions of the Spanish Conquistadors.

The "Lost City" of Macu Picu is an example of the sophisticated engineering feats of the people of the Inca Empire.

The quality of their stone construction techniques was so great that these buildings have withstood more than 500 years of the ravages of nature, including numerous earthquakes.

One of the greatest accomplishments of the Incan engineers was the massive road network of over 6000 miles that tied the empire together.

One of the best sources of our knowledge of the Inca comes from their burial sites.  Those of the rich and powerful have large stores of items that tell much about their culture and technologies.

Inca Fortress of Sayhuman at Cusco is another example of the precise stonework that was a hallmark of the engineering skills of the people of the Inca.

The massive size of the stones (many weigh over twenty tons) is readily noticeable in this picture.

Lama, the largest pack animal in Pre-Columbian America. It is one of the wonders of these impressive people that their massive stone engineering works were completed without assistance of any large draft animals. Note the terraced fields in the background that date to the time of the Inca Empire. The use of terraced farmland greatly improved the available food for the Inca Nation.

Timeline of Inca Culture.