London's old-school healing garden.

This coffee shop lies hidden beneath a historic church.

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

Hear the quietest sound from across the dome.

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Remnants of a Victorian garden feature sitting in public woodland.

The anatomical-pathological collection of a man who changed surgery.

The curios of pharmacist and collector Henry Wellcome.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

An unusual round church in London with a Templar past.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

An artistic tribute to the famous singer, just around the corner from where he was born.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A network of concealed passageways lies within a busy London Underground station.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.