Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

When the city of Manchester built a new centralized heating network, they did it with style.

This retro diner claims to be the birthplace of poutine.

The enigmatic symbol on this incineration plant's smokestack is, in fact, a one-of-a-kind clock.

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

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

This statue honors Marvin Klegman, a heroic child who died while saving another boy's life in a 1949 earthquake, and shares his long untold story.

This vessel is the final ocean-going paddle steamer in the world.

A scientific observatory managed the largest Portuguese astronomy research unit.

Nicknamed the 'Chestergate Hotel,' the underground tunnel had beds, lights, and even flushing toilets.

The arch marks the beginning of the road for northbound travelers.

Although called a funicular by both its owner and the locals this historic railroad is actually a rack and pinion system.

Take in a sweeping views of Guanajuato—and save yourself a hike up a steep hill—on this funicular.

A computer bug so primitive it was an actual insect.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This one-of-its-kind shipyard brings the 12th-century Viking Age back to life.

Part mural and part sculpture, this work of art sits in the middle of the Promenade, as if swimming in a river of asphalt towards the ocean.

This sidewalk tribute honors Colorado's great culinary creation.

This water-powered cliffside railway is one of the steepest funiculars in the world.

The river-powered ferry dates back to 1970s.

Visit the last surviving outlet of a once popular chain of coffeeshops.

Check out the 125-pound chocolate reindeer in the back of this candy shop.

Deep in the forest of northern Denmark, this secret underground bunker was built at the height of the Cold War.