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

Beneath the most controversial monument in Mexico City is a cultural center that exhibits only digital art.

A jewel of the Mexico city skyline now slowly crumbles after surviving an earthquake.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

Come face to face with the ferocious visage of the serpent-headed mother goddess of the Aztecs.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

This stunning and ethereal mural symbolizes the beauty, unity, and diversity of humankind.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The modern birthplace of Irish freedom.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

The house's confection-like decorations are the result of one man's painstaking work over decades.

A half-acre utopia in the New Mexico desert features a graveyard, a game of horseshoes, a library, and a mailbox.

This is one really big nut.