The most decorated dog of World War I is preserved in the Smithsonian.

The walls of the iconic dome are hollow and have a secret stairway.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

Home to items never before seen by the public.

2300-year-old Roman road connecting the empire.

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

The pockmarks across the building's facade are remnants of the Blitz.

The bones of two medieval royal lions were discovered at the historic fortress.

Its collection includes a broad array of social, geographic, graphic design, and political history.

The commemorative stone column conceals a secret laboratory.

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

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

A memorial to a dog that inspired rioting in the streets of London.

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

A Roman spa buried deep beneath the City of London.

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

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

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

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

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.