Sniff the Titan Arum's rotting flesh.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

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

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Become a prohibition rebel.

A semi-scholarly approach to sex.

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

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

The final resting place to 300 Victorian-era pets hides inside the city park.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

A kaleidoscopic warehouse-maze of handmade neon signs.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

The solemn exterior conceals an opulent interior of this 17th century church.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.