Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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.

This grand gothic brewery has been pumping out suds for over a hundred years.

A historic arena where the Beatles played their first concert in the U.S.

Also known as the Founding Church of Scientology.

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

Through the decades, Black music stars have performed at this historic hub for music and the arts.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

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

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

She stares out across six lanes of traffic, clutching a musket and infant with determination.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A relic of FDR's brief foray into utopian urban planning.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.