Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A 50-foot-tall statue of Jesus where a stairway transports the faithful into his body.

A magically clear, blue river that seems to spring from nowhere.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

A man-made island designed to look like a massive battleship.

Smoked mummies housed in mountainside caves.

Hundreds of wooden coffins dangle from cliffs and caves in the Philippines.

From scholastic to sepulchral - now under reconstruction.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Deep under Manhattan is the largest construction project in city history. So far, the project has taken the lives of 23 workers, or "a man a mile."

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Peek through the gates at this oasis from the city, full of Old English charm.

Walk over a 150 year old manhole.

A hip bar decorated with walls of golden skulls.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

One of only two commuter aerial tramways in the United States.

A very classy 1920s-era bar right in Grand Central Station.

A posh members-only club with a literally dramatic history.

Believed to have once stored either human remains or rice wine, thousands of mysterious stone jars lie in ruin.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

A former French military respite turned jungle tourism hotspot.

A battle between nature and architecture in the Cambodian jungle.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

Stunning wetlands ablaze with pink lotus flowers.