This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

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

Named for a doctor who made a breakthrough in London’s cholera epidemic, this 1800s pub was also the site of a queer “kiss-in.”

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

These Victorian era devil sculptures were designed to spite a local vicar.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

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

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

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

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

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

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

There's an exclusive Beefeaters pub hidden in the Tower of London.

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

The ritual has been performed uninterrupted for nearly 700 years.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The world's longest known cave system.

A 20-foot-tall egg painted in a traditional Czech patterns by the Czech community in Wilson, Kansas.

This beloved roadside attraction welcomes visitors with his signature neon smile.

An iconic 1960s theater with a Buckminster Fuller-style geodesic dome.

The arch that celebrated the completion of the Lincoln and Victory highways.