A marvel of Byzantine engineering under the streets of Istanbul.

What was once a unique system of urban elevators is turning into a mechanical ruin.

This sculpture meant to honor the bravery of the Indigenous Mapuche people of Chile proved controversial.

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.

A beautiful young girl said to have been buried alive in her coffin…

A bright little alley in La Boca is a part of tango history.

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

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

The deepest metro station in the world.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

Singapore's oldest Hindu temple.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

30 years worth of pressed-tin, bakalite, and characters both loved and forgotten.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

Ming Dynasty necropolis raided during the Cultural Revolution.

The most famous location in China was home to whole dynasties worth of imperial rulers.

An out-of-place slice of France, smack in the middle of Shanghai.