The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Golden Gate Park's historic collection of plants.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This expansive bridge in the Canadian wilderness was originally just built for friends.

From mining complex to industrial exhibition, this museum once played a major part in the X-Files.

Limestone caves with spectacular showcase chambers.

The park preserves a single, rare species of carnivorous plant that spells doom for unsuspecting insects.

Only known mainland rookery of the threatened Stellar sea lion.

This natural marble cave is one of only five national monuments in Oregon.

Train tunnel running underneath Quebec City.

A contemporary fresco movement illustrates the region's rich history.

Bright, rebellious indigenous murals dating back to the Spanish Conquest inexplicably cover the walls of this Catholic church.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

If you want to take a peek at Area 51, this is legally as close as you're going to get.