Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

This shop for all your super spy needs hides an educational secret.

Tubing through a cave lit with glowworms is a magical underground experience.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A Hawaiian stairway to heaven—that you can't climb.

A seemingly endless landscape of pure salt stretches far across Bolivia.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This lab's maddening silence is good for business but bad for sanity.

A beautiful geyser under environmental threat.

A hotel and restaurant serving as the mecca of kitsch.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A massive underwater sinkhole made famous by Jacques Cousteau.

Rising from the sea like a stone monster.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The only theatre in the world constructed specifically for sound movement.

A hand-built folk art installation covered with messages of God's love.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An Australian lake whose pink hue defies scientific explanation.

These fantastically named natural pools look like something out of a Scottish myth.

The world's only museum devoted to the wonders of fluorescence.