A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

An overlooked memorial honoring the local Washington residents who died in World War I.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

Perhaps the most scandalous statue of America's first president.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Where pardoned turkeys once spent their all-too-brief final days.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

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.

Go take a picture with the inventor of the daguerreotype photographic process.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

The unbelievably opulent home built for an infamous newspaperman.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.