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Muir's clock, circa 1860.  Exhibit at the Wisconsin Historical Society, Madison.
Madison, Wisconsin

John Muir's Alarm Clock Desk

Before he was America’s most famous conservationist, John Muir was an ingenious mechanical inventor.
43.0754, -89.4000
The devastated north end of Halifax
Halifax, Nova Scotia

Halifax Explosion Memorial

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.
44.6658, -63.6012
A piece by French artist JR. This was a photograph of immigrants who had been marked for deportation, awaiting their appeal hearing.
Jersey City, New Jersey

Ellis Island Immigrant Hospital

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.
40.6976, -74.0425
Tracked Levitated Research Vehicle.
Pueblo, Colorado

Forgotten Grumman TLRV

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.
38.2662, -104.6160
Bend, Oregon

Lava River Cave

The longest continuous lava tube in Oregon.
43.8946, -121.3688
Tree molds.
La Pine, Oregon

Lava Cast Forest

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.
Sponsored by Travel Oregon
The temple from the visitor's center.
Kensington, Maryland

Washington, D.C. Mormon Temple

The tallest Mormon temple in the world soars above the Beltway.
39.0158, -77.0645
Uncle Beazley
Washington, D.C.

Uncle Beazley the Triceratops

A celebrity from the late Cretaceous period.
38.9319, -77.0524
Hangar One
Moffett Field, California

Hangar One

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.
37.4129, -122.0539
Libby's Water Tower
Sunnyvale, California

Libby's Water Tower

A giant can of fruit cocktail is all that remains of what was once the world's largest cannery.
37.3827, -122.0355
Inside the WeirdStuff Warehouse
Sunnyvale, California

WeirdStuff Warehouse

An Aladdin's cave of old Silicon Valley tech.
37.4169, -122.0220
Sounding rocket.
Lanham, Maryland

NASA Goddard Rocket Garden

A lawn full of retired spacecraft on display at one of NASA's first research labs.
38.9928, -76.8470
Model of a partial dinosaur skeleton.
Laurel, Maryland

Laurel Dinosaur Park

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.
39.0708, -76.8686
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
Inside the old model museum
Washington, D.C.

The Old Patent Model Museum

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.
38.8981, -77.0225
National Building Museum
Washington, D.C.

National Building Museum

Fittingly, America's museum of architecture is itself a magnificently designed old building.
38.8978, -77.0175
Congressional Country Club in 2011.
Bethesda, Maryland

Congressional Country Club

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.
38.9963, -77.1764
The propeller can currently be found in the Air and Space Museum.
Washington, D.C.

NASA Full Scale Wind Tunnel Propeller

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.
38.8872, -77.0210
The carousel in summer months
Washington, D.C.

Carousel on the National Mall

Washington's iconic carousel has a nice piece of Civil Rights history.
38.8891, -77.0246
Lime kilns.
Washington, D.C.

Godey Lime Kilns

A historic ruin just 20 feet away from a busy highway onramp.
38.9037, -77.0564
Washington, D.C.

Amelia Earhart's Lockheed Vega

The "lovely red Vega" of the legendary record-settling pilot.
38.8879, -77.0200
Washington, D.C.

Starship Enterprise NCC-1701

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.
38.8881, -77.0199
Aerial view of Greenbelt, Maryland, 1939.
Greenbelt, Maryland

Greenbelt Historic District

A relic of FDR's brief foray into utopian urban planning.
39.0006, -76.8805
The gorgeous formations at Valley of Fire State Park.
Clark County, Nevada

Valley of Fire

The drama of nature in full effect in this Nevada State Park.
Sponsored by TravelNevada