The world's largest fully steerable radio telescope.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

San Francisco's newly reopened hands-on science museum.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

The stone circle honors the 19 firemen who perished during the Yarnell Hill Fire.

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

Every year, festive decorations appear on this juniper tree located in the median strip of a busy highway.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

The handsome statue is a tribute to the post riders who traversed 52 miles of tough Arizona terrain.

Guns that have been defending San Francisco since 1904.

One of few lasting examples of the brief octagon craze that developed into folly.

Quite simply the largest tree in the world (by volume).

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Four hundred granite steps were built into this massive rock by the National Park Service.

Once a year, at exactly 11:11 a.m., this monument comes to life.