This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Cave shrine on Monte Pellegrino.

Thousands of well-dressed mummies below a monastery.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The largest and most famous wax anatomical collection anywhere in the world.

The oldest operating pharmacy in the world features 800-year-old recipes.

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

Rebuilt remains of a temple to Roman god Mithras.

This hidden green space is the city's second largest conservatory.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

This landmark church concealed a crypt packed with bones that was discovered thanks to the London Blitz.

An unusual round church in London with a Templar past.

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

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

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A little slice of Japan and its aesthetics in London's Holland Park.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.