213 UNESCO Sites.
How many have you visited?

This 15th-century Inca citadel sits at 2,430 meters in the Andes. Its stone blocks fit together without mortar so tightly that a knife blade can't slip between them.

Why go: Hike the Inca Trail to arrive at sunrise and see stonework that has survived five centuries of earthquakes.

The world's largest coral reef system stretches over 2,300 kilometers and can be seen from space. It supports more than 1,500 species of fish.

Why go: Snorkel or dive over coral gardens and swim with sea turtles, manta rays, and clownfish.

Angkor Wat is the largest religious monument in the world, covering over 400 acres. Built as a Hindu temple in the 12th century, it later became Buddhist.

Why go: Watch the sunrise behind the towers reflected in the moat. Explore temples overgrown by jungle roots and see carved scenes from Hindu and Buddhist stories.

The Serengeti is home to the Great Migration, where over 1.5 million wildebeest and hundreds of thousands of zebras travel 800 kilometers in a yearly loop.

Why go: Watch the herds cross the plains and rivers during the Great Migration, and look for the Big Five on safari.

The UNESCO-listed historic center covers nearly 3,000 years of history, from the Colosseum to the Pantheon.

Why go: Walk past the Colosseum, toss a coin in the Trevi Fountain, and look up at the Pantheon's dome, open to the sky for nearly 2,000 years.

The Great Wall runs over 20,000 kilometers across northern China and was built by many dynasties over 2,000 years. Despite the myth, you can't see it from space with the naked eye.

Why go: Hike between watchtowers on restored sections near Beijing, or walk wild, unrestored stretches where you may be alone.

These volcanic islands inspired Darwin's theory of evolution. Their isolation produced species found nowhere else, including marine iguanas, the only sea-going lizards.

Why go: Swim with sea lions, walk among giant tortoises, and watch blue-footed boobies dance. The animals here aren't afraid of people.

Shah Jahan built the Taj Mahal as a tomb for his wife. It took 22 years and 20,000 workers, and its white marble looks pink at dawn and golden in moonlight.

Why go: See the Taj Mahal at dawn, reflected in its long pools, and look closely at the precious stones set into the marble.