Krakow's own version of the Hollywood Walk of Fame.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

A memorial to the beloved brown bear that served in the Polish army during World War II.

Where visitors can play more than 150 retro arcade games.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This man-made mound monument was built out of soil from all across the Polish empire.

An impressive museum dedicated to the resource that made the Scandinavian country rich.

A former factory now pays tribute to a local industry fueled by sardines.

A unique sculpture designed to outline humanity's reliance on oil.

Walk 2,300 feet above the ground on the "Troll's Tongue."

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

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

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

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The last four extravagant street signs of London's historic banking street.

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

London's smallest police station is barely the size of a phone booth.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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