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.

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

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

Hear the quietest sound from across the dome.

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

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

The world's newest astronomical clock is also its most accurate.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Steadily reminding Czechia of its past.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.