It's a moment that will live with you forever. Midnight on the 600-year-old St. Charles Bridge, with the placid Vltava River on either side, looking up at Prague Castle, which seems to be mingling with the stars.

But you're not alone.

Maybe it's the feeling you get from the unorthodox shadows cast by the grisly medieval statues on the bridge. Maybe it's the voice of Franz Kafka impersonated by the wind. Maybe it's just the old man staring at you from a mere five feet away that's giving you the creeps.