In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A memorial to the atrocities of the People's Socialist Republic of Albania.

Chicago’s incendiary role in the labor movement.

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

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

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

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

The last remaining vestige of a popular 1999 public art display.

An avant garde art museum at the University of Chicago.

Where the Model T was made and the assembly line was invented.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

This relief sculpture depicts America’s most famous coffee break.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

This Ohio cemetery is home to the remains of many Confederate officers and soldiers who were once held nearby as prisoners of war.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This colorful gate stands as an entrance to the walled city of Old San Juan.