The premiere of the documentary series, which investigates the world created by America's First Peoples some 15,000 years ago. First up: Who they were. The answer hides in Amazonian cave paintings, Mexican burial chambers, New Mexico's Chaco Canyon and waves off California's coast.

Recalling the rise of great American nations, from monarchies to democracies. Included: lost cities in Mexico; a temple in Peru; a potlatch ceremony in the Pacific Northwest; and a tapestry of shell beads in upstate New York.

Discovering the cosmological secrets behind America's ancient cities. Scientists explore some of the world's largest pyramids and 3D-scan a lost city of monumental mounds on the Mississippi River. Also: native elders reveal ancient powers of the sky.

How resistance, survival and revival are revealed through an empire of Comanche warriors, secret messages encoded in an Aztec manuscript and a grass bridge in the Andes that spans mountains and centuries.