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

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

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

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

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

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

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

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

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

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

A small car graveyard sits in the shadow of the famous Cadillac Ranch.

This stately clubhouse has showcased German-American culture for over a century.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Collection of skeletal systems from the "world's leading supplier of osteological specimens."

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Scattered around Atlanta are little doors with big charm.