Site of a former hidden treehouse in New Orleans.

Odd outsider art installations surround a Gold Rush-era ghost town.

The ghostly remains of an accidental sea.

The fairy tale castle of the "fairy-tale king."

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

An exquisite tunnel of cascading flowers.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

On Japan's Tashirojima Island, cats are king.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A strange house built only at night, with rumored mystic inspiration.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

An optical illusion found amid a logged redwood forest.

This massive redwood tree has a hole in the base big enough to drive through.

This (occupied) house is 10 feet wide and full of spite.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Approximately 250,000 people left homeless by the great earthquake and fires found shelter in Golden Gate Park.

A monument to the love people have for their pets.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

A whimsical antique shop with a strong air of mystery, filled with items from ages, and what feels like worlds, past.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

World's largest Christmas store.

The city is full of whimsical portals to another world.