UNESCO designates natural and man-made sites of "outstanding universal value" as world heritage sites to protect them for future generations. View sites by country or use an interactive world map to locate sites from around the world...

The tallest man-made monument in the U.S., the arch is based on a weighted catenary design conceived by Finnish American architect Eero Saarinen. In 1967, the 630 feet (190 m) structure was opened to the public as part of the Jefferson...