Australian Lake set aglow by Noctiluca Scintillans.

A beautiful, but toxic, lake formed by mining.

Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

A swing to dangle you off the very edge.

Founded as a refugee camp, now a popular tourist spot.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

This picturesque mansion has gone from opulent ruin to nature museum.

One man's homage to the sun continues to grow like a glass fractal.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

This legendary city has been a tourist attraction for centuries.

A popular swimming hole that hides one of America's most deadly diving spots.

Quite possibly the last cross all humans will ever see.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

A clear blue swimming hole with hidden caves, still unexplored.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.