A park and memorial dedicated to the victims of the deadliest school massacre in American history.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

An ode to filmmaker George A. Romero, who used the mall to film an iconic horror movie.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

This 700-year-old street food market features baby octopus and soy donuts.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

These pretty kitties killed and ate as many as 135 railway workers.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A sharp sculpture made of thousands of pieces of jagged glass.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

An ancient octagonal weather station named for the eight Greek gods of wind.

Climb to the top of the world's largest seated bronze Buddha.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

Because there's no place like home.

This glamorous old building is said to have inspired the Tower of Terror.

Khmer Rouge's high security prison.

5,000 skulls in memorial to those killed by the Khmer Rouge.