In the old city of St. Augustine, Florida, on the shore of Matanzas Bay, stands a fortress unlike any other in the United States. The Castillo de San Marcos is

Guarding the narrow entrance to one of the finest harbours in the Americas, on a rocky headland facing the old city of Havana, stands the Castillo de los Tres Reyes

On a steep hill overlooking the old walled city of Cartagena, on the Caribbean coast of Colombia, sprawls one of the greatest fortresses ever built in the Americas. The Castillo

Stand at the tip of the old city of San Juan, where the land runs out into the Atlantic, and you find yourself dwarfed by one of the mightiest fortresses

In central Turkey, thousands of people once lived in a honeycomb town with no streets, entering their homes through the roof and burying their dead beneath the floor. Meet Çatalhöyük, one of humanity’s first great experiments in living together.

Cayonu is a Pre-Pottery Neolithic site in southeastern Turkey where early farming, animal domestication, and organized architecture emerged nearly 11,000 years ago.

On the desert coast of Peru stands a temple whose walls are lined with hundreds of carved stones showing marching warriors and their dismembered victims. Meet Cerro Sechin, one of the oldest and most haunting monuments in the Americas.

Some castles overwhelm you with size, and some seduce you with setting. Cesky Krumlov belongs firmly to the second kind. It does not sprawl across a mountain or crown a

Chaco Canyon in New Mexico held multi-story stone great houses, engineered roads, and a solar Sun Dagger built by Ancestral Puebloan people between 850 and 1150 CE.

Chan Chan is the largest adobe city ever built, the Peruvian capital of the Kingdom of Chimor famous for its carved fish and seabird friezes.