The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

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

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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

A memorial for public executions that dates back to the 14th century.

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

This South London cemetery holds the remains of more than 15,000 people.

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

Kwanu'sila the Thunderbird has been silently watching over Chicago for more than 100 years (kind of).

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

London's smallest police station is barely the size of a phone booth.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The world's oldest optical museum is an odd collection where the exhibits look at you.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

The medieval woodcut-style artwork chronicles life in medieval London.

The bronze uniforms commemorate the vital role of women during World War II.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Giant, friendly pelicans in Central London, the most unlikely of places.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.