Remains of an abandoned coral city.

Once the most densely populated place in the world, this island is now a ghost town.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.

This outdoor observatory offers stellar views and a scale model of our solar system.

The location of the Bridge of Death and the Gorge of Eternal Peril in "Monty Python and the Holy Grail."

The unique funeral practices of the Toraja can be seen here with graves carved into caves and hung off cliffs.

The world’s largest LED display, built over an F1 race circuit.

The ruin of a Japanese love hotel almost completely overgrown with brambles.

This bridge is so steep it looks like a rollercoaster.

An architectural experiment in the Lower Ninth Ward, this row house is capable of floating as high as the Katrina floodwaters.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

An unassuming secret door once led to a legendary watering hole.

Where cemeteries are carved into the side of cliffs and infants are buried in the hollows of trees.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.