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The Chemical Treatment Tower
Washington, D.C.

Washington Aqueduct Chemical Tower

Every drop of D.C. tap water flows through this old waterworks.
38.9376, -77.1131
The ruins.
Washington, D.C.

Ruins of the Columbian Cannon Foundry

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.
38.9054, -77.0790
The Madonna in Bethesda
Bethesda, Maryland

Madonna of the Trail

She stares out across six lanes of traffic, clutching a musket and infant with determination.
38.9839, -77.0942
Washington, D.C.

Legislative Bell System

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.
38.8905, -77.0091
The 'electric dynamo' book conveying apparatus.
Washington, D.C.

Library of Congress Book Conveyor Tunnel

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.
38.8887, -77.0054
Looking out towards the Hungarian Embassy.
Washington, D.C.

Pierce Mill Spy Station

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.
38.9405, -77.0522
A marble Senate bathtub.
Washington, D.C.

Senate Bathtubs

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.
38.8899, -77.0091
Drawers of samples of dried paint on glass slides.
Washington, D.C.

The National Gallery's Art Materials Collection

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments and primers preserved for posterity.
38.8913, -77.0194
Contemporary appearance of the Rammed Earth Pilot House.
Cabin John, Maryland

USDA Rammed Earth House

This suburban house is made of dirt, and almost sparked a revolution in home construction.
38.9763, -77.1527
Front of the old Tabulating Machine Co. building on 31st Street.
Washington, D.C.

The Tabulating Machine Co.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.
38.9045, -77.0617
The plaque in foreview, with JFK's green doorstep across the street.
Washington, D.C.

Freezing Newsmen Plaque

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.
38.9067, -77.0663
Corporal Chas Ippel on the right, died on July 26, 1863.
Arlington, Virginia

Arlington Cemetery's Headstone-Eating Trees

The rogue roots are gradually consuming some of the historic marble grave markers.
38.8772, -77.0752
Nice view down Memorial Avenue.
Arlington, Virginia

Pierre L’Enfant’s (Second) Gravesite

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.
38.8811, -77.0723
The memorial mainmast.
Arlington, Virginia

Joseph Marthon Memorial Mainmast

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.
38.8783, -77.0687
Washington, D.C.

Churchill and Mandela Call and Response

When it comes to handsignals (and colonialism) rock always beats scissors.
38.9202, -77.0617
The tunnels all look slightly differiently
Washington, D.C.

Capitol Building Tunnel System

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.
38.8922, -77.0080
The windows have been bricked up for years.
Washington, D.C.

Washington Aqueduct Castle Gatehouse

A building shaped like the Army Corps of Engineers logo, because why not?
38.9110, -77.0895
Union Station.
Washington, D.C.

Site of the Union Station Train Crash

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.
38.8978, -77.0062
Man Controlling Trade.
Washington, D.C.

Man Controlling Trade

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.
38.8925, -77.0204
Washington, D.C.

Capitalsaurus Court

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.
38.8820, -77.0058
The Cairo still dwarfs its neighbors.
Washington, D.C.

The Cairo

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.
38.9113, -77.0375
Dashes mark the Potomac low tide waterline, dots mark Roache's Run
Arlington, Virginia

Alexander's Island Border Dispute

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.
38.8785, -77.0533
Vancouver, Canada

9 O'Clock Gun

This quirky piece of naval artillery has been deafening Canadians for over a century.
49.2981, -123.1176
Note the potential iron sight on the middle post.
Washington, D.C.

Gun Barrel Fence

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.
38.9094, -77.0574