Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

Two small markers remember the Alamo's feline protectors.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This mysterious and unique painting is filled with symbolism.

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

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

This magnificently macabre shield shows the power of chivalrous love in medieval times.

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

An architectural oddity hides in plain sight on this iconic London bridge.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

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

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

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

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.