The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

Italian cave with exceptional acoustics and an unsavory history.

Why have you never heard of the second most popular tourist site in New York?

These "anatomical machines" are only one of the many strange items in this Italian crypt.

One man's homage to the sun continues to grow like a glass fractal.

A castle that was built stone by stone by an eccentric journalist.

A 9 year-old boy’s elaborate cardboard arcade in his father’s used auto parts store.

Made famous by cable TV, this oddball collection of antiques and collectibles is a cut above the rest.

Remains of a Greek freighter trapped off of Rocky Point in 1961.

A "haunted" landmark on the coast of Southern California.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

Megachurch turned Catholic church comprised of 10,000 glass panes.

The site of murders and Satanic cult gatherings.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

These Nubian pyramids are strange and unique, even by pyramid standards.

The abandoned personal amusement park of the King of Pop.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.