A throwback train ride transports passengers through one of the lesser-known national parks in the country.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A colorful architectural gem in Seattle's uniquely modern Central Library.

The first park built over a freeway is a brutalist masterwork.

Seattle's own bad art museum located inside Cafe Racer.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Nuclear reactor created the plutonium used on Nagasaki.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

This isolated airport in the middle of the Everglades sees more alligators than planes.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Illegal drag racing two stories beneath Chicago’s streets.

Rippling sand dunes frozen in the Arizona rock.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A sulfuric hellscape in southern Italy.

Medicinal spa created with the discharge from a geothermal energy plant.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.