This historic Victorian mansion is allegedly so haunted that a signed waiver is required to enter.

A volcanic core jutting above the plain between the Snake and Boise Rivers, a marker identifies the reference point for all U.S. Government Surveys in Idaho.

The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

A Native American petroglyph, the site of an emigrants' waystation, and the ruins of an early 20th-century sheep camp are all found at this crossroads.

Below this enormous headstone lie Billy and Benny McCrary, better known as the "McGuire Twins."

Catch two 18-foot-tall ranchers mid-brawl as you drive by on Highway 285.

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

The world's only surviving heavy cruiser has a haunting history.

Picturesque and haunting, these 160-year-old stone ruins on top of a bluff are the only remains of a settler's legacy.

Construction uncovered this trove of fossils, which visitors are welcome to add to their own collections.

A cemetery that holds graves for the forgotten children of a burned orphanage.

Six separate cemeteries became one, on the grounds of a former schoolhouse.

A Colorado store that specializes in all things spiritual, metaphysical, and witchy.

A former infectious disease laboratory chronicles how tuberculosis shaped a village nestled in the Adirondacks.

Ornate and vibrant, this temple is a colorful place of worship for Columbus's Thai and Laotian communities.

The model behind the iconic 3D test model.

A life-sized recreation of the megafauna that once roamed this region is a feature at the birthplace of American paleontology.

Dozens of tiny doors dot Newport's Mansion Hill neighborhood.

Northern Kentucky’s very own Notre Dame showcases intricate stained glass and the bones of saints.

The lasting remains of a historic spa.

This millstone-topped marker details the history of a mill that served as a landmark for both Union and Confederate soldiers during the American Civil War.

An abandoned incline railway site is now a green space with six acres of trails connecting hilltop neighborhoods.

One of the smallest churches in the United States is located along the side of the road in a residential neighborhood.