The glacier tucked within a New Zealand rainforest.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Largest maize maze in the Southern hemisphere built with GPS technology on more than two acres.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A perfect turquoise lake colored with glacier dust.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Thousands of well-dressed mummies below a monastery.

A madman's personal garden filled with 1,000 sculpted heads.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Neo-cave art on the macro scale.

Ride the subways of yesteryear.

“Wagon Jobber" turned smokehouse magnate's family-owned business is still going strong 100 years later.

Volunteer-run library dedicated to exploring five decades of activism history.

One of only two remaining Victorian-era greenhouses in New York.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.