Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

You will not be able to miss this building.

The largest clown school in Britain offering accredited degrees.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A movable feast that is an East London institution.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

Two plaques commemorate the site of Shakespeare's first theatre.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.