The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This friendly fellow was built to honor an advancement in mineral processing.

A memorial to a larger-than-life legend, inside a county that also holds Bunyan's death certificate.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

This Vietnamese hell cave lets visitors take a walk through a devilish underworld full of demons.

This bridge is embedded with a giant steel dragon that breathes fire from its mouth.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

See prehistoric footprints, plus two complete mastodon skeletons.

An ever-evolving wall of graffiti art off East Liberty Street.

Its floors are marked by colorful cues depicting Michigan's native fauna.

A watercolor recreation of a famous fresco unearthed at Pompeii.

This erect, phallic geological spire wasn't always named so domestically.

A hidden oasis in the heart of Minneapolis is also an Important Bird Area.

Inside the Wayne County airport is an amazing collection of lights and sounds.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

A display of magnificent stained glass windows is the first exhibit of its kind.

These pretty kitties killed and ate as many as 135 railway workers.

A giant granite cross remembers missionary Father Frederic Baraga, and his safe passage across an angry Lake Superior.

When waves crash onto this section of beach, the rocks sing a song.