The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Art deco landmark on the outskirts of Washington, D.C.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The "lovely red Vega" of the legendary record-settling pilot.

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.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

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

The walls of the iconic dome are hollow and have a secret stairway.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A nostalgic bibliographic gem.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

Largest Roman Catholic church in North America.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The house where John Wilkes Booth conspired with his co-conspirators.

A haunting tribute to pioneering photographer Clover Adams.

A wondrous old library overlooking the nation's capital.