Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

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

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

There is beauty and history in the ruins of this former company town.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A crumbling hospital from the 1850s on Roosevelt Island.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

This museum promotes informed contraception by documenting its often secret past.

Lavish royal estate punctuated with heated greenhouses.

An old department store turned Nazi prison turned artist commune.

An abandoned swimming pool decays on the outskirts of Berlin.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

Super-heavy Nazi architectural experiment.

A wunderkammer of mysterious objects and stories.

A collection of abandoned typographic signs from Berlin and beyond.