Fittingly, America's museum of architecture is itself a magnificently designed old building.

Obscure Freemasons still live in D.C.’s largest private residence.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This poor little statue is the most vandalized memorial in Washington.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Largest Roman Catholic church in North America.

A haunting tribute to pioneering photographer Clover Adams.