This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

Playable, historic pinball machines fill this Alameda museum.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

Built by the inventor of the radio, this abandoned hotel has housed early radio employees, military men, and a dangerous cult.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Floating man-made island and upscale restaurant.

In this century-old literary safehouse, print is alive and well.

A modern mechanical planetary system, part of a 10,000 year clock.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This shop specializes in oddities and Victorian-inspired wonders.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

A winding, cliffside stretch of road overlooking the Delaware River.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

This derelict building used to house infirm Freemasons, their widows, and orphans.

A once grand hotel is being retaken by the wilderness it once capitalized on.

An eccentric playboy's astounding natural history collection.

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