A circus legend leaves an unexpected endowment.

A chilling disappearance (and rescue) of a child uncovers a geological mystery.

The largest known Ancient Egyptian obelisk.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Cold war icon and onetime "hole" in the iron curtain.

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

World's second largest particle accelerator, where nature reveals its secrets.

The faint remains of a Polish news empire still linger.

Where old school Polish Chicago and young hipster Chicago live side by side.

100 year tradition of fist fights, marked by marble footsteps.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

This man-made mound monument was built out of soil from all across the Polish empire.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

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

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A cemetery for only coon hounds in northwest Alabama.

Famous for its bio-luminescent inhabitants, known as "dismalites."

148 feet long and in the middle of a verdant forest.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

The final resting place of the great navigator, or maybe his brother.

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

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