A walk through the historic city center, under the streets of Seattle.

The metal leaves on this tree are engraved with the names of Holocaust victims.

According to local legend, a tree grew from the stake that killed this alleged vampire. In reality, he probably died from influenza.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

Massive still life just off the highway in Kansas.

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

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Illegal drag racing two stories beneath Chicago’s streets.

The 606 is a decade in the making.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A Bibliophile's Dream.

A statue high in a hill that represents how Buffalo Bill got his name.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

A mouldering Colombian bull ring stands as a reminder of the country's complicated relationship with a brutal sport.

The colonial city's social history is reflected in its fanciful door knockers.

Would you dare to dangle from a great height in a wooden basket?

The Andean town where every single building is decorated with a brightly colored frieze.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Baroque celebration of the end of the Great Plague of Vienna.

Three hundred illuminated pillars form an “artificial forest” in Medellín.

A museum of memories in what was once one of the most violent cities in the world.