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

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

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

The world's oldest known salt mine.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.