The oldest continuously operating fish market in the United States.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Largest Roman Catholic church in North America.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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.

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

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

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.

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.

Home to a vast and influential collection of Shakespeareana.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

A beloved, quirky little fountain featuring a large frog spitting water at a naked boy.

This rare female version of the Muffler Man has its clothes removed each summer to signal the start of pool season.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.