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

Decades before the scandal, this staircase on the river was a literal "water gate."

The most accurate timepiece in the world.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

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

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

Home to a vast and influential collection of Shakespeareana.

A much-maligned monument to teetotalism.

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

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

The museum moved on, but the diorama remain.