The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

An abandoned observatory in the middle of the Illinois prairie.

A historic and oft-filmed prison stands in a Chicago suburb.

While he no longer has an eatery to give him context, this off-brand Paul Bunyan still holds his giant hot dog with pride.

Take a break from all the boring business of death at this funeral home mini-golf course.

A curious collection of miniatures in a quiet corner of the Chicago Children's Museum.

This overgrown Illinois water park offers a whole new type of adventure.

Former hotel turned into haunted playground.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A reproduction of earth's many biomes.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

The fading, forgotten remains of a once bright and booming factory.

One of the largest, oldest, darkest, quietest motel rooms in the world.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.