A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

These strikingly colorful paintings were created by a mysterious Mesoamerican civilization.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

The singular ruins of a mysterious lost city.

The stoutest tree in the world.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A flooded Mexican cave that hides a river beneath the water.

Where layer cakes tower above one’s head and there is never a shortage of icing.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

The splendor of this 17th century golden chapel has led it to be called the "eighth wonder of the world."

The winter home of millions of migrating monarch butterflies.

The only castle in North America to ever house European sovereigns.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Frida Kahlo's childhood home, now a museum of her life and works.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This single room has survived the centuries with almost no deterioration.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

A hugely vast Irish landscape of barren rock that stretches for miles.