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

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

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

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

A fine, large-aperture telescope available for public use.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

Tens of thousands of tiny birds swarm into one school chimney every fall.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

Private collection of art inspired by cabinets of curiosity.

A heavenly experience, right here on Terra Firma.

This collection honors the iconic, and proudly American lighter that just won't quit.

Visit this playground of waterfalls, caves and sinkholes.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

This bridge is haunted by the ghost of a distraught mother.

One of the largest underground systems runs under Canada's largest urban center.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Hundreds of protractors affixed to surfaces all over the city.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.