The hidden lair of an alchemist rediscovered in a 2002 flood.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Long tunnels run under the ancient chariot racing circuit to the tower.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Mountain where Jesus was first tempted by the Devil.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This red lake 4,000 meters above sea level is home to rare flamingos.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

A monument to the conquistador became increasingly controversial in the very city that he founded.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

Now containing the bones of the actual conquistador, instead of someone else.

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

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

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.