A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Hans Christian Andersen for the postmodern world.

Old Danish castle immortalized in Shakespeare's Hamlet.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

One part local history, 99 parts gruesome haunted house.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

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

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

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

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

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

This stone complex marks the urban center of a lost civilization.

The large collection of pre-Columbian pottery might make you blush.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

An unexpected desert oasis in South America.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

Mystic Incan rock piles three miles above sea level.

Did Inca children also slide down these smooth rocky slopes above Cusco?