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Places visited in Arco, Idaho
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The green sand on Papakōlea.
Naalehu, Hawaii

Papakōlea Beach

Semi-precious green sand on Hawaii's big island.
18.9361, -155.6465
'Akaka Falls
Pepeekeo, Hawaii

'Akaka Falls

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.
19.8531, -155.1565
Kaumana Lava Tubes
Hilo, Hawaii

Kaumana Lava Tubes

Hide from Hawaii's tourist hordes in these relatively unknown, and unguarded lava caves.
19.6869, -155.1308
Ka Lae
Naalehu, Hawaii

Ka Lae

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.
18.9124, -155.6802
Parker Ranch
Waimea, Hawaii

Parker Ranch

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.
20.0199, -155.6821
Captain Cook, Hawaii

Place of Refuge

Ancient holy grounds that granted amnesty to all those who stepped inside.
19.4215, -155.9105
Kealakekua, Hawaii

Captain Cook Monument

A controversial memorial at the place where Captain Cook met his violent end.
19.4813, -155.9334
The Canada France Hawaii Telescope.
Hilo, Hawaii

Mauna Kea

Earth's tallest volcano is home to a dozen world-class observatories.
19.8244, -155.4733
Devils Tower, Wyoming

Devils Tower

The first declared National Monument in the United States.
44.5904, -104.7147
Custer, South Dakota

Crazy Horse Memorial

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.
43.8368, -103.6244
The Glorious Diorama
Boulder City, Nevada

Hoover Dam Old Exhibit Building

Experience a charming 1930's version of "infotainment."
36.0155, -114.7474
A view of the walls and moat from the main entrance.
Berlin, Germany

Spandauer Zitadelle (Spandau Citadel)

A 12th century fortress containing some of Berlin's oldest buildings.
52.5412, 13.2128
Entrance to the camp.
Oranienburg, Germany

Sachsenhausen Concentration Camp

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.
52.7635, 13.2602
The Apollo 1 crew jokingly showing their faith in the craft.
Cape Canaveral, Florida

Launch Complex 34

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.
28.5219, -80.5614
Exterior view of the Vehicle Assembly Building.
Titusville, Florida

NASA Vehicle Assembly Building

A building so large that it has its own weather.
28.5863, -80.6513
Reverse shot
Cabo San Lucas, Mexico

The Arch of Cabo San Lucas

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.
22.8760, -109.8947
Underground Cathedral (Flickr/magro kr)
Wieliczka, Poland

Wieliczka Salt Mine

An underground city of salt.
49.9830, 20.0557
San Francisco, California

Battery Chamberlin

Guns that have been defending San Francisco since 1904.
37.7940, -122.4827
The cemetery in 2014
San Francisco, California

San Francisco's Pet Cemetery

A monument to the love people have for their pets.
37.8026, -122.4674
San Francisco, California

House of Air

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.
37.8049, -122.4688
San Francisco, California

Palace of Fine Arts

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.
37.8029, -122.4482
Niantic converted to a hotel
San Francisco, California

Site of the Niantic

Gold Rush ship-turned-hotel buried underneath San Francisco's financial district.
37.7949, -122.4017
The Rosslyn Metro escalator. (Steven Cohen/Atlas Obscura)
Arlington, Virginia

Rosslyn Metro Escalator

At 207 feet, one of the world's longest continuous escalators.
38.8959, -77.0715
Washington, D.C.

Amelia Earhart's Lockheed Vega

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