The legendary building that needed ghostly approval before being built.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Where religious effigies, magic soaps, and occult candles are brought to customers at wholesale prices.

America's most famous piece of self-built architecture.

A surreal, Gaudi-inspired play space near an Anaheim community center.

This former lieutenant governor's home is brimming with curiosities.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

Human-made caves excavated to hide a secret society of wealthy pagans.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Preserved "bog person" that is over 2,000 years old.

Over 9,000 brains collected between 1945 and 1982 demonstrate the results of untreated mental illness.

This encrypted monolith protected a secret of Norse mythology by hiding in a church wall for over a millennium.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

The largest collection of hair jewelry in Europe reminds you how creepy 19th-century love was.

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

Scattered throughout London are ancient remnants of the city's former bounding wall.

One of the world's largest collections of pathological specimens.

This South London cemetery holds the remains of more than 15,000 people.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

Private collection of art inspired by cabinets of curiosity.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.