An emerald-green grotto just a short trip from Austin.

A historic observatory precariously perched at the "Top of Europe."

The ruins of the "20-year town" lay out among the mountains of Alberta.

A mysterious spirit totem at the edge of Navajo lands.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

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.

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

Large Hadron Collider and the Birthplace of World Wide Web.

The celebrated eyesore created by starry-eyed sweethearts.

A museum dedicated to the history and exploration of both popular music and science fiction.

This historic Victorian hotel has a scandalous history of affairs and murder.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

Treehouse motel and treehouse-building school.

Only known mainland rookery of the threatened Stellar sea lion.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The mysterious round rocks of Schooner Gulch.

A trash dump made beautiful by nature's power.

An optical illusion found amid a logged redwood forest.

This massive redwood tree has a hole in the base big enough to drive through.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.