Engineering

A wide array of locomotives call this outdoor museum home.

This vintage short line in Amish country runs passenger steam train excursions and still hauls freight.

Geothermal resources are cooled in this oddly-shaped structure before being used for irrigation

A short tunnel built straight through a magmatic dike.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

This freewheeling amusement ride is the last of its kind.

The first curved wooden bridge in Canada was built as part of the Alaska-Canada Highway.

A unique look into the bowels of a century-old funicular.

Can you see the face staring out at you from the buttress of this bridge?

A huge railroad museum with over 100 pieces of rolling stock focusing on the railroad history of Pennsylvania.

Now abandoned, the first reinforced concrete bridge in Alabama still stands over the Pea River.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.

Abandoned blast furnaces are an enduring reminder of Scranton's once booming iron business.

The hulking remains of the Leesburg Lime Company Kiln lie dormant behind a historical marker close to the W&OD trail.

The first mountain submarine had its initial and last voyage in 1898.

This colossal underground passage paved the way for large-scale drainage and access tunnels across the U.S., but it almost wasn’t built.

Some of the last remaining relics of one of World War II's most important invasions.

A non-stop elevator ride in Vienna's city hall.