The castle still holds traces of the abandoned Roman fort it was built atop.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Tourists who rely on a transit map to find the iconic Beatles location often end up in a far-off neighborhood.

One of London's oldest houses contains a mixture of both old and modern features.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

Likely the first car with an internal combustion engine constructed in the United Kingdom.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

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

A living memorial to the trees London lost during the Great Storm of 1987.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

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

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

Putting the "mod" in "modular" since 2000.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

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

The commemorative stone column conceals a secret laboratory.

A unique tribute to the millions of animals who served and died for the British military.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

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