In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Legend says train robbers stashed their gold within the depths of this unusual cave.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

The fifth-longest natural arch in the world, and the longest outside China.

Visitors to this library are in for a real-world education in modernist architecture.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Only intact Ichthyosaur skeleton in the United States.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

Dig for your own trilobites in this goldmine of invertebrates.

The longest living non-clonal organisms on Earth.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

At this museum in Iceland, visitors can sample fermented Greenland shark.

A modern Nordic Pompeii on the Icelandic island of Heimaey.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This beautiful, historic church looks like something out of a simpler past.

This black church sits alone among a field of lava rock.

This tiny museum's sizable collection is jammed into a former underground public toilet.

Three columns of volcanic rock shoot out of the ocean.