The pedestrian traffic signals in Brazil's teeming metropolis light up with clues to nearby landmarks.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

The bookstore with bookshelves built into unlikely places.

Beautiful public park off the beaten path and away from tourists.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

This public elevator links the lower city to the upper city of Salvador.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

Unusual rock formations eroded into a landscape of stone beasts.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Pilgrimage site for star-crossed lovers.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

Elaborate tile work in this railway station tells the story of Portugal.

A hidden three-foot-wide house separates these two regal churches.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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