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The hospital tower.
Bethesda, Maryland

Walter Reed National Military Medical Center

FDR's Art Deco hospital tower was hopelessly inefficient.
39.0007, -77.0947
Former Riggs Bank in Georgetown.
Washington, D.C.

Riggs Bank: 'The Bank of Presidents'

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.
38.8991, -77.0340
The heavy iron door is unlocked.
Washington, D.C.

Mount Zion Cemetery's Underground Railroad Shelter

Escaped slaves may have hidden inside a corpse vault.
38.9118, -77.0532
Entrance to the garbage tunnel
Washington, D.C.

Congressional Garbage Tunnel

The tunnel under the Capitol Building where Congress takes out its trash.
38.8931, -77.0102
Cutaway watercolors of the present day dome
Washington, D.C.

Inside the Capitol Dome

The walls of the iconic dome are hollow and have a secret stairway.
38.8898, -77.0090
George Cassiday in 1930
Washington, D.C.

Bootlegging Room in the Cannon House Office Building

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.
38.8873, -77.0075
The Main Reading Room Catalog
Washington, D.C.

Library of Congress Card Catalog

A nostalgic bibliographic gem.
38.8867, -77.0042
Washington, D.C.

U.S. Naval Observatory Library

A horde of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.
38.9215, -77.0670
Senate side.
Washington, D.C.

Capitol Bollards

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.
38.8898, -77.0060
Bankhead
Bankhead, Canada

Bankhead Ghost Town

The ruins of the "20-year town" lay out among the mountains of Alberta.
51.2296, -115.5241
Improvement District No. 9, Canada

Lake Minnewanka Underwater Ghost Town

The only way to visit this old resort hotel is with scuba gear.
51.2502, -115.4823
View of the Potomac Park Levee
Washington, D.C.

Potomac Park Flood Levee

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.
38.8914, -77.0395
The tallest one on the right side is Eisenhower Tower
Eldon, Canada

Eisenhower Tower

Canada’s surprisingly controversial monument to Dwight Eisenhower.
51.3517, -115.9642
The Rogers Vault
Washington, D.C.

Treasury Department Cash Vault

Where the U.S. government kept its actual treasure, before Fort Knox.
38.8976, -77.0344
The market from above
Washington, D.C.

Maine Avenue Fish Market

The oldest continuously operating fish market in the United States.
Sponsored by Dogfish Head Brewery
Temperance Fountain
Washington, D.C.

Temperance Fountain

A much-maligned monument to teetotalism.
Sponsored by Dogfish Head Brewery
The Brewmaster's Castle
Washington, D.C.

The Brewmaster's Castle

This grand gothic brewery has been pumping out suds for over a hundred years.
Sponsored by Dogfish Head Brewery
Historian Bill Lebovich at 2016 Obscura Day tour of the Stones.
Washington, D.C.

The Capitol Stones

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.
Sponsored by Dogfish Head Brewery
Washington, D.C.

U.S. Naval Observatory Master Clock

The most accurate timepiece in the world.
Sponsored by Dogfish Head Brewery
Washington, D.C.

Blind Whino

A historic neighborhood church is reborn as a psychedelic arts collective.
38.8804, -77.0120
Classic mini golf hole at East Potomac
Washington, D.C.

East Potomac Park Mini Golf

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.
38.8746, -77.0263
Washington, D.C.

Arizona Avenue Trestle

The span is crooked and made from two older recycled bridges.
38.9245, -77.1072
Washington, D.C.

Southwest Duck Pond

This lovely pocket park is one of the most under appreciated in D.C.
38.8787, -77.0197
Washington, D.C.

Fireworks Safety Zone on the National Mall

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.
38.8889, -77.0440