A science teacher's dream.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A hollow cement depiction of time's inexorable effect on the human body.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The world's longest known cave system.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

A speakeasy takes on Chicago's drinking culture.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A museum and shop on Bourbon Street located in the French Quarter.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A beautiful Victorian-era cemetery, complete with a miniature village.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.