This old-fashioned carhop restaurant gave the world the waffle cone.

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

The land is home to swimming ponies and a legendary 18th-century treasure.

Brussels' favorite peeing boy has a sister.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

This elaborate towering structure was once famed for its revolutionary height.

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.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

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.