Inside this Krakow church, an explosion of psychedelic color.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

The last king of Poland was interred in this church nearly 200 years after his death.

This bell stars in a tragic love tale and is said to make wishes come true.

Atop this library is one of the most beautiful green spaces in Warsaw.

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

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

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

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

An underground city of salt.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

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

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

A theater sits abandoned on Roosevelt Road, once majestic in splendor, now majestic in decay.

A European-style bath house in Chicago.

These murals have been brightening a Chicago beach for more than 30 years.

The last remnants of a lakeside airport that was bulldozed overnight by the mayor of Chicago.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.