The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

A 140-year-old castle with underground caves hidden in San Francisco.

A huge musical instrument played by the ocean.

A pair of mutilated bronze octopuses slump at the base of the monument honoring California's admission to the U.S.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

With the touch of a button, you can read a randomly selected short story.

Appropriation-friendly collection of books, periodicals, and more.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

These azure waters were thought to lead to the Mayan Underworld.

A flooded Mexican cave that hides a river beneath the water.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

A Nesting Doll of Churches.

Architectureal fantasy quarter of Rome.