This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A hollow cement depiction of time's inexorable effect on the human body.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A very peculiar and macabre statue calls Tugatog Cemetery home.

This eerie abandoned building with a dark history is said to be one of the most haunted places in the Philippines.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

An enigmatic mural hiding in plain sight in one of São Paulo's busiest metro stations.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

The largest open-air contemporary art center in Latin America is a unique experience in the Atlantic Forest.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

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

This giant mural of Santa Muerte in downtown São Paulo reminds passersby of their own mortality.

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

The crypts are so large they're basically their own underground church.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

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

A grand entrance to one of the world's smallest Chinatowns.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.