A psychedelic labyrinth on the San Francisco bay.

A hands-off space for graffiti artists to hone and display their skills.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

An Italian hillside ghost town.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The colorful soil of Iran’s "Rainbow Island" attracts artists and nature lovers.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

Inside the world's largest seed bank, WWII botanists elected to starve to death rather than compromise their collection.

Specimens collected by the author of "Lolita" and self-taught lepidopterist are exhibited in his childhood home.

The past, present, and future of Russia's signature alcohol is remembered in the world's only museum dedicated to the starchy spirit.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

Where a great scandal unfolded with a famous female revivalist at its center.

Perhaps the world's only gas station inspired by a political scandal.

The Home and murder site of the witch of Rehmeyers Hollow.