National Geographic April 2011

Genius Of The Inca

How did they build an empire? Archaeologists find new clues.

The ghost town of Machu Picchu was “found” 100 years ago.

A Jewel In Two Crowns

Crimea was once Russia’s paradise. Now it belongs to Ukraine.

Volcano Next Door

To save an African city, scientists drop into a red-hot lava lake.

The Acid Sea

Sea stars shrink. Sea urchins are stunted. We are the cause.

Miracle Above Manhattan

New Yorkers can float over busy streets in an innovative park.

Indomitable Snow Frogs

When Alpine lakes start to defrost, their frogs go courting.