These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The ruins of an open-air theater built on this Georgia island in the 1970s.

Internet rumors, often involving Icelandic singer Bjork, have abounded regarding this isolated outcrop of rock.

This tall stone wall with no door and ill-matched windows was built centuries ago, and used as a shelter for domesticated pigeons.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

This heritage rail line meanders through Delaware’s Red Clay Valley.

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

The San Andreas Fault spectacularly offsets this creek.

Working mining and drilling equipment demonstrate 150 years of energy history.

This cabin from the 1850s is one of the first structures built by Chinese immigrants in California.

Napa's oldest building is now a Mexican restaurant.

The perfect spot for a picnic, right next to a giant ballistic missile.

Two groundbreaking brothers from Pasadena.

An old whaling station now serves to give the public a look at the commercial whaling industry, no longer a part of Monterey's economy.

The oldest orange tree in California spawned a generation of citrus farmers.

A Romanesque sanctuary of calm amid the bustle of downtown Los Angeles.

This odd little museum holds exhibits on everything from blacksmith equipment to hair jewelry.

This 19th century train workshop is a treasure trove of railroad history.

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.