Black cat statues guard this temple-like Egyptian revival factory.

Follow the original medieval paths that wind through this intriguing section of the city.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Faceless white figures loom over the city from the rooftop.

Tiki luxury on Nob Hill.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

The television series' iconic giant foot was borrowed from this classical painting.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

The largest of London's subterranean rivers and once a mad, bad center of London life.

The taxidermied remains of a once-great parrot.

An unusual round church in London with a Templar past.

This historic club for wayward boys has shaped some of the biggest names in music almost as much as they have shaped it.

Seat of the Duke and Duchess of Devonshire for centuries.

"A hideous albatross in the Hudson River Valley."

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Floating pink tap installed for a flower show in London.

A cluttered and astounding collection of antiquities and curiosities.

Hear the quietest sound from across the dome.

This landmark cemetery in Boston was created more than 300 years ago.

Shelves covered in dozens of coffee bean varieties fill this North End institution.