A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

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

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

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

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

A 125-meter long "tribute to the Brazilian people."

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

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

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

An odd little fishing town that is inundated by tourists looking to be locked up in a cage and surrounded by great white sharks, because why not?

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

Last stop before the top of the highest peak in the world.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This golden temple is surrounded by hundreds of stone tablets that comprise the "world's largest book."

The oldest teak bridge in the world is made from the remains of a royal palace.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.