This London marker celebrates the spot where the world-famous English band was founded.

Mysterious concrete spires left on a small Canadian hill.

The oldest operating steam locomotive in Canada runs along this heritage railway.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

The ritual has been performed uninterrupted for nearly 700 years.

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

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

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

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

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

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.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The commemorative stone column conceals a secret laboratory.

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The world's only museum devoted to the wonders of fluorescence.

The spectacular history of spectacles on display.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

The last of Amsterdam's original sea level markers remaining in place.

A floating cat sanctuary on an Amsterdam canal.

A collection of venomous snakes and reptiles for the whole family to enjoy.

Thailand museum of bottles of all shapes and sizes filled with intricate and beautiful art.