Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

London's amazing modernist public square that never was.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

This overlooked street light once served as a KGB dead letter box.

A plaque marks the underground site of one of London's "lost rivers."

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

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

The taxidermied remains of a once-great parrot.

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

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

The last four extravagant street signs of London's historic banking street.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.