The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Krakow's own version of the Hollywood Walk of Fame.

Seven dragon statues—including one that breathes real fire—are scattered throughout the streets of Krakow.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Real bones which are said to have belonged to a Polish dragon.

Inside this Krakow church, an explosion of psychedelic color.

Remnants from a time before electricity.

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

Extremely famous in his native country, this Cracovian painter is all but unknown beyond Polish borders.

The first home and studio that belonged to the famous architect.

After an Illinois church was struck by lightning and burned down, Frank Lloyd Wright designed this replacement.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

This historic hotel invented the chocolate brownie.

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

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

Designed as a reminder of one of the darkest moments in Austrian history.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.