An office built to look like a giant basket.

Gargantuan home of Russian science.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

A six-ton wedding present for the King of the Scots.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

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

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

A mysterious shape catches the eye in this 16th-century painting.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

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

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

The ritual has been performed uninterrupted for nearly 700 years.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

What appears to be an ancient Roman temple is actually a Catholic church.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A marvel of Byzantine engineering under the streets of Istanbul.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

An Austrian house of bones filled with hundreds of intricately painted skulls.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Rome's semi-secret peephole vista is also a former Crusader stronghold.