Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Towering basalt columns, a creation of fire and ice.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

A dangling church built over a Colombian gorge.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Largest man-made excavation on earth!

A replica that won't float away.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A small flooded ghost town with a few scattered structures remaining.