A display of magnificent stained glass windows is the first exhibit of its kind.

A century-old network of freight tunnels underneath the city's historic business district.

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

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

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

Illegal drag racing two stories beneath Chicago’s streets.

No one knows how many bodies are in this vault in a Chicago public park.

Rifle through images of skyscrapers, Worlds Fairs, and more in the largest public postcard repository in America.

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

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

Orthodox church partially financed by Tsar Nicolas II.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

The first memorial dedicated solely to the Black troops who fought for the Union.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

A portal into the bricked up canal that runs through the heart of Washington D.C.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

These abandoned waterworks are crumbling into the Potomac River.

An overlooked memorial honoring the local Washington residents who died in World War I.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

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