Live long and prosper in Vulcan, Alberta.

A neutrino detector built into the largest man-made underground cavity in the world.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

One of the world's largest Tesla coils.

Massive crater in central Oregon.

Home of the International Space Hall of Fame.

Native Americans built this circle of stones, which was used to predict astronomical events.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

The first declared National Monument in the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Pennsylvania's own Roswell-style UFO mystery.

Enter the cabin of a life-sized Hindenburg replica.

Macabre astrological automaton clock dating to the late 1400s.

Experience a charming 1930's version of "infotainment."

A volcanic landmark located on an Ice age lake bed.

The longest continuous lava tube in Oregon.

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

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

World's only nuclear reactor operated by liberal arts undergraduates.

This collection of solar timekeepers includes the world's first digital sundial.

The single richest source of elemental discoveries in the world.

Enormous underground chamber built to detect 'ghost particles' of the universe.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.